What is the formula of photoelectric effect?
What is the formula of photoelectric effect?
The Formula for Photoelectric Effect According to the famous Einstein explanation of the photoelectric effect: The energy of the photon will be sum total of energy needed to remove the electron and kinetic energy of the emitted electron. Thus h \nu= W + E. Where, h. Planck’s constant.
Which statement best describes the photoelectric effect?
The photoelectric effect is the emission of electrons from a metallic surface when there is a relatively high frequency of electromagnetic radiation on it. The smallest unit of light, with no mass and no electric charge, or any electromagnetic energy. Photons serve as ions as well as waves.
What is the best description of the work function in terms of the photoelectric effect?
The explanation for the photoelectric effect goes like this: it takes a certain energy to eject an electron from a metal surface. This energy is known as the work function (W), which depends on the metal. A photon with an energy less than the work function will never be able to eject electrons.
What is Einstein’s photoelectric effect equation?
Where h = Planck’s constant = 6.6261 × 10-34 Js. Since light is bundled up into photons, Einstein theorized that when a photon falls on the surface of a metal, the entire photon’s energy is transferred to the electron.
What is Einstein’s photoelectric equation 12?
Einstein’s photoelectric equation is given as, The energy of the incident photon is equal to the sum of the maximum kinetic energy of an electron and the work function.
What are the observations of photoelectric effect?
Note that the stopping potential is independent to the intensity of light. The Maximum kinetic energy increases with increase in the frequency of light. With a higher frequency of light (ν), the stopping potential becomes more negative which implies that the kinetic energy of electrons also increases.
What is photoelectric effect establish Einstein’s photoelectric equation?
Each quantum has an energy h, if this energy exceeds the minimum energy to emit electron then the electron is emitted with maximum kinetic energy. Planck’s constant is h = 6.62 × 10−34 joule-sec. This equation is known as Einstein’s photoelectric equation.
What are the characteristics of photoelectric effect?
The photoelectric effect has three important characteristics that cannot be explained by classical physics: (1) the absence of a lag time, (2) the independence of the kinetic energy of photoelectrons on the intensity of incident radiation, and (3) the presence of a cut-off frequency.
What is photoelectric effect b write any two observations of photoelectric effect?
Variation of photoelectric current with intensity of radiation absorbed: When the values of photoelectric current were plotted against the different values for intensity of light, it was observed to be a straight line passing through the origin.
What is Hertz and Lenard’s observation?
Hertz and Lenards observation In 1887 by Heinrich Hertz observed that when light falls on a metal surface, some electrons near the surface absorb enough energy from the incident radiation to overcome the attraction of the positive ions in the material of the surface.
What is photoelectric effect using Einstein photoelectric equation explain characteristics of the effect?
One photon can cause the emission of one photoelectron. Therefore, with the increase in the intensity of radiation, there will be an increase in the photoelectron interactions and the rate of emission of electrons. The emission of a photoelectron is the result of a collision between a photon and an electron.
What are the observations made during photoelectric effect?
When experiments were performed to look at the effect of light amplitude and frequency, the following results were observed: The kinetic energy of photoelectrons increases with light frequency. Electric current remains constant as light frequency increases. Electric current increases with light amplitude.
Who explained the photoelectric effect?
In 1905, Albert Einstein published a paper advancing the hypothesis that light energy is carried in discrete quantized packets to explain experimental data from the photoelectric effect. Einstein was awarded the Nobel Prize in 1921 for his discovery of the “Law of the photoelectric effect”.
What are some examples of photoelectric effect?
An electroscope is an important tool in illustrating the photoelectric effect. For example, if the electroscope is negatively charged throughout, there is an excess of electrons and the leaf is separated from the stem. If high-frequency light shines on the cap, the electroscope discharges, and the leaf will fall limp.
What is 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.
What does the photoelectric effect do?
The photoelectric effect refers to the emission, or ejection, of electrons from the surface of, generally, a metal in response to incident light. Energy contained within the incident light is absorbed by electrons within the metal, giving the electrons sufficient energy to be ‘knocked’ out of, that is, emitted from, the surface of the metal.
