i) State photoelectric effect. ii) In photoelectric effect, at what frequency the electron will be ejected with certain kinetic energy (γ0 = threshold frequency) iii) In the photo-electron emission why the number of electrons emitted increases with increase in intensity of radiation?
Answers
Explanation:
Ans (i) Photoelectric effect is the phenomenon of emission of electrons from the surface of a metal when light photons (electromagnetic radiation) of a certain frequency strikes the metal surface. ... Number of photoelectrons emitted from the metal surface per second is directly proportional to intensity of incident light.
Ans (ii) In the photoelectric effect, electrons are ejected by a metal plate when hit by photons of electromagnetic radiation. ... The shorter the wavelength (the higher the frequency), the more the energy of the photon.
Ans (iii) If the photon energy is too low, the electron is unable to escape the material. Increasing the intensity of the light increases the number of photons in the beam of light and thus increases the number of electrons excited but does not increase the energy that each electron possesses.