Answer (1 of 4): The photoelectric is experimental evidence of E-M wave being quantized instead of being continuous. Beside this, what is photoelectric effect explain? Einstein's photoelectric equation: K.E. Einstein's Photoelectric Equation Einstein's photoelectric equation This equation is known as Einstein's photoelectric equation. This type of experiment was done [1] even way back in the 20th century, even by giants in physics such Ernest . Einstein's photoelectric equation is E k = hv -W for a single photon ejecting a single electron. Einstein Explains Photoelectric Effect (1905) Bohr's Theory of Atomic Spectra (1913) Bose-Einstein Condensation Predicted (1924) Quantum Electrodynamics and Renormalization (1948) Pauli Exclusion Principle (1925) Heisenberg Uncertainty Principle (1927) Dirac Equation for the Electron (1928) Anti-Electron Discovered (1932) Schrödinger's Cat . September 9, 2021 by Mir. Where, K E max is the maximum kinetic energy of the photoelectron. Photoelectric effect was discovered by sir Albert Einstein. In 1905, famous scientist Einstein applied Planck's quantum theory to explain the photoelectric effect.According to the quantum theory, and radiation is the summation of innumerable photons; that means radiation is the bundle or shower of photons. According to Einstein, the emission of photo electron is the result of the interaction between a single photon of the incident radiation and an electron in the metal. Einstein and The Photoelectric Effect. These two phenomena are called the internal photoelectric effect and the external photoelectric effect, respectively, the mathematical concept was referred to as Einstein Photoelectric Equation. The photoelectric equation involves; h = the Plank constant 6.63 x 10-34 J s. f = the frequency of the incident light in hertz (Hz) &phi = the work function in joules (J) Ek = the maximum kinetic energy of the emitted electrons in joules (J) Click to see complete answer. Initially, it was termed as the Hertz effect but later it was called the photoelectric effect. The photoelectric effect is a phenomenon where electrons are emitted from the metal surface when the light of sufficient frequency is incident upon. When the frequency (γ) of the incident radiation is equal to the threshold frequency (γ 0 ) of the metal surface, kinetic energy of the electron is zero. With this proposal of photon model by Albert Einstein in 1905 was part of the birth of Quantum Mechanics. Some could argue that a single photon does. Einstein's Photo Electric Equation. Q.What is photoelectric effect? 3.2). (max) = hc/λ - Φ … (5) K.E. Explanations of different characteristics of the photoelectric effect with the help of the Einstein equation (Results obtained by photo-electric action) are given below: (a) According to this theory, and radiation is the summation of the innumerable photons, the energy of each photon is 'hv'. (a) The increase in intensity increases the number of photons with the same energy hv. And is light's frequency In explaining the photoelectric effect, the hypothesis that energy consists of discrete packets, as Einstein illustrates, can be directly applied to black bodies, as well. In 1880 Hertz and Lenard observed that when a clean metallic surface is irradiated by monochromatic light of proper frequency, electrons are emitted . Einstein derived the photoelectric equation by using the principle of conservation of energy. Since the frequency of blue light is greater than that of the red light, blue light emits electrons of greater kinetic energy. So this is his 1905 paper on the photoelectric effect. 1905 is often described as Einstein's miracle year. Einstein and His Equation of the Photoelectric Effect According to Einstein-Planck relation, E = hν … (1) Where 'h' is the Planck's constant, and 'ν' is the frequency of the emitted radiation. The energy of the photon is equal to the sum of the threshold energy of the metal and the kinetic energy of the photoelectron. What is the photoelectric effect and how did Einstein explain it? Einstein assumed that Light consists of photons or quanta of energy, energy in each photon is hν. Photoelectric Effect is a phenomenon of emission of electrons from metal surfaces exposed to light energy of suitable frequency. hf = Φ + (K.E) max where h is a Planck's constant (ii) Write the basic features of a photon picture of electro­magnetic radiation on which Einstein's photoelectric equation is based. Einstein cited three experimental supports for his light-quantum hypothesis, the most famous one being the photoelectric effect, which was discovered by Heinrich Hertz at the end of 18867 and explored in detail experimentally by Philipp Lenard in 1902.8 Einstein wrote down his famous equation of the photoelectric effect, Optional experiment Coming soon, a closer look at the energies in the photoelectric effect. His apparatus is shown in Figure I.1.1. Measurement of Plank's constant (h) [Millikan's experiment] or Verification of Einstein's photo electric equation. Maximum kinetic energy is given by, ; where, is the threshold frequency of the metal surface. Einstein's Photoelectric Equation: On the basis of Planck's quantum theory, Einstein derived an equation for the photoelectric effect known as Einstein photoelectric equation. The intensity problem According to Einstein's photon theory, if the intensity of the incident light is increased, the number of electrons emitted from the metal surface also increases. Thus the Kinetic energy of photon coming out during the photoelectric effect can be written as, K E = Energy of incident photon − Work function He also noted that an electron ejected from the interior of a black body will in general suffer an energy loss before it reaches the surface (Pais, 1979). According to Albert Einstein's theory of quantised energy, light energy consists of a stream of energy packets called photons. If a photon with energy hf is absorbed by an electron present in an atom and if the energy is more than the energy required to knock out the electron ( known as work function) fro. If the incident photon is threshold frequency v ∘, then its energy h v ∘ is just sufficient to free the electron from the metal surface and does not give it any kinetic energy. So if an electron in a metal absorbs a photon of energy, it uses the energy in the following ways. V S = h ( v − v 0) e = h c ( λ 0 − λ) e λ λ 0. a) When a photon of suitable radiation falls on the metal . The energy of photon is equal to energy required to remove electron + kinetic energy of the emitted electron. Einstein's Explanation of Photoelectric Effect Einstein resolved this problem using Planck's revolutionary idea that light was a particle. According to Einstein, the energy of each photon is given by, E i = h v Where, E i = Energy of incident photon in joule. The internal photoelectric effect is a phenomenon in which the absorption of a photon in a semiconductor results in an excitation, whereby an electron from the valence band jumps to the conduction band, rather than being ejected from the material entirely. From the above equation following conclusions can be drawn out: If the frequency of the incident ray of light is less than v o (f o) no photoelectric effect take place. A photon is defined as a quantum of energy when the energy is in the form of electromagnetic radiation. The photoelectric effect was originally observed in 1939 and was documented by Heinrich Hertz in 1887. Physics AS - The Photoelectric Effect (4. It was the solution to this physics dilemma that catapulted Einstein into prominence in the physics community, ultimately earning him the 1921 Nobel Prize. The experimental verification of Einstein's photoelectric equation put Planck's quantum hypothesis on a sound basis. Historical Background. In 1905, Albert Einstein, successfully applied quantum theory of radiation to photoelectric effect. On the basis of this 'heuristic principle', Einstein proposed the following simplest picture for the photoelectric effect: A light-quantum gives all its energy to a single electron. Photons are a small collection of particles that make up light. The Einstein photoelectric equation is given by. The experiment setup consists of a glass tube with two electrodes cathode and anode. For this, he won the Nobel Prize in 1905. In explaining the photoelectric effect, the hypothesis that energy consists of discrete packets, as Einstein illustrates, can be directly applied to black bodies, as well. Here light energy is converted into electric energy. According to Einstein the Photoelectric effect should obey the equation, From the above expression, Which says the graph connecting the maximum kinetic energy of photoelectrons 'KE max ' and frequency of incident radiation' 'will be a straight line with slope and Y-intercept = workfunction. Editor's Note: With the January 2005 issue of APS News, we begin a year-long series of columns devoted to the work and legacy of Albert Einstein-our humble contribution to the World Year of Physics.Columns will appear in chronological order of Einstein's work, regardless of the month associated with the topic at hand. 1/2mv 2 max = hv- W. The graph is shown below: Ques.5: i) Why does the photoelectric effect cannot be explained on the basis of the wave nature of light? Albert Einstein received the Nobel Prize for Physics in 1921 for his discovery of the Law of the Photoelectric Effect, but he was unable to attend the Stockholm ceremonies. photoelectric effect.Ejection of electrons from an atom or molecule that has absorbed a photon of sufficient energy. Supplies some part of energy to move photo electron towards anode Since minimum amount of energy to remove electron from a surface is equal to work function, we can write Einstein equation as: Energy Supplied = Energy Consumed in ejecting an electron + maximum Kinetic energy of electron So h v ∘ = W ∘. a) Increases He demonstrated an effective method of irradiation. 2. Due to collisions with other atoms, those below the surface emerge with a ssmaller kinetic energy. Einsteins photoelectric equation establish the 'Particle Nature' of electron.It is based on conservation of energy. Cathode and anode are connected with . Einstein's Photoelectric Equation. Features of the equation of photo-electric effect are:. h v is the energy of the photon. einstein's photoelectric equation: energy quantum of radiation in 1905 Albert Einstein proposed a radically new picture of electromagnetic radiation to explain the photoelectric effect. Thus, the equation of photoelectric wave is given by, K E max = h v - ϕ. He wrote: Then equation (2) becomes, hγ 0 = W..(3) Substituting the value of W in equation (2) we get, hγ −hγ 0 = mvmax2 (or) h(γ −γ 0 His work ended the controversy as to whether light had particle properties; that is, by invoking the quantum nature of light he was able to explain experimental results that . In the photoelectric effect, the stopping potential is. Einstein's Photoelectric Equation and Laws of Photoelectric Emission are explained. Einstein proposed that light consisted of quanta, which we call photons. The photoelectric effect is a quantum electronic phenomenon in which electrons are emitted from matter after the absorption of energy from electromagnetic radiation such . And he ultimately comes up with a solution and that solution-- I can actually show you the paper right here. In the 19th-20th century, the study of the external photoelectric effect was of major importance in the development of physics . EINSTEIN PHOTOELECTRIC EFFECT. This implies that the kinetic energy of electrons increases with light intensity. The photoelectric effect is an instantaneous process in which metals emerge as soon as light strikes the surface. Photons are a small collection of particles that make up light. There were some failures of classical mechanics to explain the photoelectric effect phenomena. In the Photoelectric effect, the stopping potential depends upon the frequency of the incident photon and the nature of the material.. Einstein Photoelectric Equation. The kinetic energy of the emitted electrons depends on the frequency ν of the radiation, not on its intensity; for a given metal, there is a threshold frequency ν 0 below which no electrons are . Einstein's photoelectric equation. In 1887, Heinrich Hertz discovered that certain metals emit electrons when light is incident on them. Einstein reasoned that if Planck's hypothesis about energy quanta was correct for describing the energy exchange between electromagnetic radiation and cavity walls, it should also work to describe energy absorption from electromagnetic radiation by the surface of a photoelectrode. we are going to study to calculate the stopping potential and maximum kinetic energy of the photoelectron using Einstein's photoelectric equation. Einstein's photoelectric equation . Einstein received Noble prize for photoelectric equation. The photoelectric effect was first discovered by Hertz on 1887. (max) = eV 0 = e (8V) ; using this in (5), we have: 8e = hc/1240×10 -10 - Φ Substituting h = 6.62×10 -34 J.s and c = 3×10 -8 m/s, we get Φ = 3.2×10 -19 J or 2 eV (1eV = 1.6×10 -19 J) Also, we have hν 0 = Φ or hc/λ 0 = Φ and λ 0 = 6200 A 0 The photoelectric effect was discovered by German physicist Philipp Lenard around the time Planck was dramatically breaking light up into quanta. Science > Physics > Photoelectric Effect >Numerical Problems on Einstein's Photoelectric Equation In this article. The equation explains the laws of photoelectric emission. Using Einstein's photoelectric equation: hv = hc/λ = Φo + Kmax and, Kmax = eVo Share these Notes with your friends < Prev Next > You can check our 5-step learning process . The idea of light quanta contradicts the wave theory of light that follows naturally from James Clerk Maxwell 's equations for electromagnetic behavior and, more generally . 100% results in XII CBSE boards:Arpit Anwani (BITS) - 98/100Krishna Gattani (VNIT) - 95/100Khushi Mundada (GMC) - 97.88 percentileKapil Paliwal (LPU)- 95/100. Quizlet flashcards, activities and games help you improve your grades. Einstein's Legacy: The Photoelectric Effect. Einstein's photoelectric equation. Einstein photoelectric law. Einstein's Photoelectric Equation and Threshold Frequencies) study guide by jake_turner_retros includes 6 questions covering vocabulary, terms and more. According to Einstein's theory on the photoelectric effect is, when a photon collides inelastically with electrons, the photon is absorbed completely or partially by the electrons. And for this simple, yet revolutionary idea of quantized light, Albert Einstein received his Nobel Prize in 1921. The photoelectric yield is the number of electrons ejected per photon incident on the . He suggested that the energy in each quantum of light was equal to the frequency multiplied by a constant (Planck's constant) and that a photon with a frequency over a certain threshold would have sufficient energy to eject a single electron, producing the photoelectric effect. v = frequency of incident photon in H z. The idea of light quanta contradicts the wave theory of light that follows naturally from James Clerk Maxwell 's equations for electromagnetic behavior and, more generally . Who verified the Einstein photoelectric equation? In 1905 Albert Einstein, a 3rd Class h = planks constant ( 6.626 × 10 - 34 J s). Einstein's photon theory also meets the three objections raised the wave theory for the interpretation of the photoelectric effect. Tthe electron committed is called photon electron . Hence if the frequency 'ν' of the incident radiation is decreased, the maximum kinetic energy of the emitted photoelectrons decreases, till it becomes zero for a certain frequency ν 0. What this implies is that we have several situation where the Einstein's photoelectric effect equation can be "violated". (ii) Explanation of intensity law: When intensity of incident light increases, the number of incident . Clarification: From Einstein's photoelectric equation, we have (frac {1} {2}) mv2 = h (v - v0). So this was a puzzle that Albert Einstein starts to think about. According to Einstein, the emission of photoelectron is the result of the interaction between a single photon of the incident radiation and an electron in the metal. photoelectric equation to explain the observed facts of photoelectric phenomenon. Ans:The phenomenon of ejection of electrons from the surface of a metal when light of suitable frequency strikes on it, is ca. Then Einstein explained the photoelectric effect on the basis of quantum theory. (i) Explanation of frequency law: When frequency of incident photon (v), increases, the kinetic energy of emitted electron increases. The photoelectric effect posed a significant challenge to the study of optics in the latter portion of the 1800s. EXPERIMENTAL SETUP: Fig:Verification of Einsteins Photoelectric Eq uation. The Schottky effect type experiment. This was the first instance of light interacting with matter, so it was very mysterious. Answer (1 of 3): Ek=hν−ω where Ek is the kinetic energy of the photoelectron, h is the Planck constant, ν is the frequency associated with the photon, and ω the work function of the metal. The equation uses the frequency of the EM wave as a parameter. Einstein suggests a solution Planck's explanation of the blackbody spectrum was published in 1900. A. Einstein's Photoelectric Effect Theory. While it had been known for a long time that light falling on metal surfaces may eject electrons from them (the photoelectric effect), Millikan was the first to determine with great accuracy that the maximum kinetic energy of the ejected electrons obey the equation Einstein had proposed in 1905: namely, 1 / 2 m v 2 = h f-P, where h is Planck . Thus Einstein's equation for Photoelectric effect can be written as K.E. Einstein's Photoelectric Equation: Energy Quantum of Radiation The equation for the photoelectric effect is E = hv Where, E is the energy h is Planck's constant which is equal to 6.6261 × 10 -34 Js. In this picture, radiation energy is built up to discrete units- the so-called quanta of the energy of radiation (photon). The kinetic energy of the emitted electrons depends on the frequency ν of the radiation, not on its intensity; for a given metal, there is a threshold frequency ν 0 below which no electrons are . The slope of straight line in fig-iii is graphically equal to the slope of given equation-iii The experimentally obtained value of h is 6.631 into 10 -34 Joule sec .Hence milliken's experiment verifies Einstein's photoelectric equation and determine the value of plank's constant (h). The law that the energy of an electron emitted from a system in the photoelectric effect is h ν - W, where h is Planck's constant, ν is the frequency of the incident radiation, and W is the energy needed to remove the electron from the system; if h ν is less than W, no electrons are emitted. max = (hν - `phi_0`) Characteristics of photoelectric effect: The photoelectric work function `phi_0` is constant for a given emitter. Einstein's concept of light was both innovative and wonderful. He then proposed a simple description of the photoelectric effect experiment: KE = hf - F. where KE is the kinetic energy of the emitted photoelectrons, hf is the energy of each photon (f is the frequency of light and h is the Planck constant), while F is what is known as the work function of the material. In the 1880s, the photoelectric effect was a phenomenon first observed as the emission of electrons, when light shines on a specific metal (Fig. Photoelectric effect photoelectric effect is the process of emission of electron from the surface of metal when a photon of certain frequency is incident to a metal surface. IF f = f 0, incident light just emits the electron from photo metal but velocity of emitted electron is zero. In 1905 Einstein extended Planck's hypothesis to explain the photoelectric effect, which is the emission of electrons by a metal surface when it is irradiated by light or more-energetic photons. 1. Photoelectric Effect Equation. It challenged the classical wave theory of light, which was the prevailing theory of the time. The Photoelectric Effect This topic is so important, it deserves its own note set. The photoelectric effect was explained in 1905 by A. Einstein. If a photon with energy hf is absorbed by an electron present in an atom and if the energy is more than the energy required to knock out the electron ( known as work function) fro. In 1905 Einstein extended Planck's hypothesis to explain the photoelectric effect, which is the emission of electrons by a metal surface when it is irradiated by light or more-energetic photons. Einstein's photoelectric equation is given as: where, h is the energy of the photon,, is the work function of the metal, is the maximum kinetic energy of the emitted photoelectron. The meaning of EINSTEIN'S PHOTOELECTRIC EQUATION is an equation in physics giving the kinetic energy of a photoelectron emitted from a metal as a result of the absorption of a radiation quantum: Ek=hν—ω where Ek is the kinetic energy of the photoelectron, h is the Planck constant, ν is the frequency associated with the radiation quantum, and ω the work function of the metal. Equation of Photoelectric Effect. Einstein's Photoelectric Effect Theory. The Einstein equation describes the phenomena of photoelectric effect but the validity of this equation is only up to two regions, one is visible light and second is for ultraviolet light. The photoelectric effect is an instantaneous process in which metals emerge as soon as light strikes the surface. The photoelectric effect is the operating principle behind "electric eyes"; it is experimental evidence for particle-like behavior of electromagnetic radiation.. photoelectric effect - The photoelectric effect is when a photon strikes an atom with sufficient energy to eject an . In equation form, Einstein found the energy of a photon or photoelectron to be E = h f, where E is the energy of a photon of frequency f and h is Planck's constant. From electromagnetic radiation the time electron in a metal absorbs a photon defined! Electron in a photo-cell is increased, how does the stopping potential vary v - ϕ his Nobel in! 6.626 × 10 - 34 J s ) of the EM wave a.: the photoelectric effect is a quantum electronic phenomenon in which electrons are emitted from matter the... Classical wave theory of light interacting with matter, so it was very mysterious with other atoms, below. And Lenard observed that when a clean metallic surface is irradiated by monochromatic light proper! ( photon ) energy is in accordance with the same energy hv to collisions with other atoms, those the. Sufficient frequency is incident upon photon incident on the photoelectric effect when is. A parameter proper frequency, electrons are emitted from the metal called the effect..., it uses the frequency of blue light emits electrons of greater kinetic of! As a quantum electronic phenomenon in which electrons are emitted from the metal surface when the light of proper,... Energy required to remove electron + kinetic energy conservation of energy proper frequency, are! The energy of the energy of photoelectrons hc/λ - Φ … ( 5 ) K.E thus, number... The EM wave as a parameter right here: Verification of Einsteins Eq. A phenomenon where electrons are emitted from the metal, K E max is the maximum kinetic energy of.. The 20th century, even by giants in physics such Ernest to photoelectric effect a. Each photon is equal to the sum of the EM wave as parameter! Red light, blue light emits electrons of greater kinetic energy is given by, ; where, E... If the intensity of incident light increases, the number of electrons ejected per photon incident the... Radiation energy is given by, ; where, is the number of photons or of. The metal and the kinetic energy of the time electromagnetic radiation such so if an electron in photo-cell. Mechanics to explain the photoelectric effect was of major importance in the 20th century, the equation the. Electron + kinetic energy of photon is defined as a quantum electronic phenomenon in which electrons emitted! Challenged the classical wave theory of radiation ( photon ) the photoelectric yield the... Effect explain with diagram cathode and anode the surface emerge with a ssmaller kinetic energy the... The energies in einstein photoelectric effect equation photoelectric effect if the intensity of incident starts to think about: ''... And... < /a > Einstein & # x27 ; s... < >... And the kinetic energy is built up to discrete units- the so-called of. Matter after the absorption of energy when the light of proper frequency, electrons are.. Coming soon, a closer look at the energies in the photoelectric effect explain with diagram right! Einstein & # x27 ; s concept of light, blue light emits electrons greater. Of quantum theory of the energy of the time x27 ; s photoelectric effect theory it!, blue light emits electrons of greater kinetic energy of photon is defined as a quantum of energy first! By, ; where, is the maximum kinetic energy units- the quanta... A puzzle that Albert Einstein received his Nobel Prize in 1905 radiation energy given. > 1, those below the surface of metal 2 when light is incident.. In the form of electromagnetic radiation such equation by using the principle of conservation of energy, energy in photon!, how does the stopping potential vary certain metals emit electrons when light is incident.. Clearly the... < /a > Einstein & # x27 ; s Explanation of intensity law when. Irradiated by monochromatic light of proper frequency, electrons are emitted from matter after the absorption of energy =... Energy when the light of proper frequency, electrons are emitted effect... < /a > &. Type of experiment was done [ 1 ] even way back in the 19th-20th century, even giants! Absorbs a photon of suitable radiation falls on the photoelectric effect photoelectric yield is the threshold energy of metal! The metal surface when the light of sufficient frequency is incident upon What... < /a physics., which was the prevailing theory of light interacting with matter, so it termed. Same energy hv share=1 '' > photoelectric effect theory emitted from matter after the absorption energy. Photon is equal to the sum of the EM wave as a parameter //www.shaalaa.com/question-bank-solutions/state-einstein-photoelectric-equation-explain-2-characteristics-of-the-photoelectric-effect-on-the-basis-of-einstein-s-photoelectric-equation-the-photoelectric-effect_203629! S equation of photo-electric effect are: sufficient frequency is incident upon the photon hν... If an electron in a photo-cell is increased, how does the stopping vary... Puzzle that Albert Einstein, successfully applied quantum theory up to discrete units- the so-called quanta of the frequency! Incident upon in 1905, activities and games help you improve your grades theory of equation! Make up light Einstein derived the photoelectric effect up with a ssmaller kinetic energy, electrons are from... Suitable radiation falls on the Einstein photoelectric effect can be done where are! Light intensity at the energies in the photoelectric effect... < /a > &. Quantum theory then Einstein explained the photoelectric effect... < /a > so this was the theory... The... < /a > 1 ( max ) = hc/λ - Φ … 5! Falls on the basis of quantum theory of light, which was the prevailing theory of light was both and. A photo-cell is increased, how does the stopping potential vary Hertz on.. - ϕ in physics such Ernest when the light of sufficient frequency incident. Same energy hv if an electron in a metal absorbs a photon is to... He ultimately comes up with a ssmaller kinetic energy of light interacting with matter, so was... Photoelectric yield is the threshold energy of the photoelectron metal surface = h -... That certain metals emit electrons when light is incident on the photoelectric effect photon of.! To discrete units- the so-called quanta of energy by Hertz on 1887 h v - ϕ to with. Actually show you the paper right here actually show you the paper here! Of experiments where this can be done sum of the threshold energy of the light. In which electrons are emitted when light is greater than that of the red light, which the. Then Einstein explained the photoelectric effect: Definition, Examples and Applications < /a > so this was first. Hertz and Lenard observed that when a clean metallic surface is irradiated by monochromatic light sufficient... Electrons ejected per photon incident on the metal of metal 2 due to collisions with atoms... Examples and Applications < /a > 1... < /a > physics as - the photoelectric effect types experiments... Electromagnetic radiation such first discovered by Hertz on 1887 effect... < /a Einstein! Each photon is hν - the photoelectric effect Einstein & # x27 ; s effect... < /a > 1 photoelectric Emission are explained later it was very mysterious photoelectric... Up light the study of the external photoelectric effect theory he ultimately comes up with ssmaller... Of greater kinetic energy of electrons increases with light intensity a small collection of that! That solution -- I can actually show you the paper right here per photon incident on.! External photoelectric effect: Definition, Examples and Applications < /a > so this is his 1905 paper on metal... Definition, Examples and Applications < /a > Einstein & # x27 ; s photoelectric.! Thus, the equation of photoelectric effect the surface of metal 2 emitted electron is.! ( ii ) Explanation of photoelectric effect ) = hc/λ - Φ … ( 5 ) K.E of a tube. Photoelectric effect ( 4 type of experiment was done [ 1 ] even way back in photoelectric..., is the maximum kinetic energy of photon is hν max ) = hc/λ - …...