Why we use battery in photoelectric effect?
The (variable battery-more likely a power supply) can be used to measure the maximum emission energy of the electrons. This, coupled with changing the wavelength of the light, can show the proportionality between frequency and photon energy.
What source is used in the photoelectric effect?
The photoelectric effect was discovered in 1887 by the German physicist Heinrich Rudolf Hertz. In connection with work on radio waves, Hertz observed that, when ultraviolet light shines on two metal electrodes with a voltage applied across them, the light changes the voltage at which sparking takes place.
What does the photoelectric effect of light depend on?
The classical expectation of the photoelectric effect was that the number of emitted electrons would depend upon the frequency, and their kinetic energy should depend upon the intensity of the light wave.
Can photoelectric effect be seen with red light?
The phenomenon of photoelectric effect takes place when the energy of the incident radiation is more than the work potential of the metal surface. It is not possible see the photoelectric effect with red light, because Red light is of long wavelength, so its energy is low, it is not enough to pull electrons.
Does the photoelectric effect depends on frequency?
Does not depend on the frequency of photon but depends only on intensity of incident light.
What is Einstein’s 11 equation?
Physicists believed that in every physical and chemical process, the mass of an isolated system is conserved till Albert Einstein show the relation , E = m c2 where c, the speed of light in vacuum is approximately 3 ×108 m s–1. This equation showed that mass and energy are equivalent and are related by E = m c2 .
Can microwaves be used in the experiment on photoelectric effect?
No. Explanation: The photoelectric effect is totally a Quantum Physics phenomenon.
What is a photosensitive surface?
Answer: A material that changes its chemical composition when exposed to electromagnetic radiation. Note: Examples of photosensitive materials are (a) the material on the surface of an optical disk prior to recording data on it and (b) the coating on unexposed photofilm used in cameras.
What is the photoelectric effect in physics?
Predictions based on light as a wave. To explain the photoelectric effect, 19th-century physicists theorized that the oscillating electric field of the incoming light wave was heating the electrons and causing them to vibrate, eventually freeing them from the metal surface.
Why does the photoelectric effect not occur when red light strikes metal?
The photoelectric effect does not occur when the red light strikes the metallic surface because the frequency of red light is lower than the threshold frequency of the metal. The photoelectric effect occurs when green light strikes the metallic surface and photoelectrons are emitted.
What are photoelectric cells used for?
Photoelectric cells were originally used to detect light, using a vacuum tube containing a cathode, to emit electrons, and an anode, to gather the resulting current. Today, these “phototubes” have advanced to semiconductor-based photodiodes that are used in applications such as solar cells and fiber optics telecommunications.
What is the kinetic energy of photoelectron emitted from a photon?
For λ = wavelength of the incident photon, then If λ < λ Th, then the photoelectric effect will take place and ejected electron will possess kinetic energy. If λ = λ Th, then just photoelectric effect will take place and kinetic energy of ejected photoelectron will be zero. If λ > λ Th, there will be no photoelectric effect.