Explain why photoelectric effect cannot be explained on the basis of wave nature of light.

Obtain Einstein’s photoelectric equation with necessary explanation.

Give the construction and working of photo emissive cell.

Briefly explain the principle and working of electron microscope.

For the photoelectric emission from cesium, show that wave theory predicts that
i) maximum kinetic energy of the photoelectrons (K_max) depends on the intensity I of the incident light.
ii) K_max does not depend on the frequency of the incident light and
iii) the time interval between the incidence of light and the ejection of photoelectrons is very long.
For the sake of simplicity, the following standard assumptions can be made when light is incident on the given material.
a) Light is absorbed in the top atomic layer of the metal
b) For a given element, each atom absorbs an equal amount of energy and this energy is proportional to its cross-sectional area A.
c) Each atom gives this energy to one of the electrons.
(Given: The work function for cesium is 2.14 eV and the power absorbed per unit area is 1.60 x 10^-6 Wm^-2 which produces a measurable photocurrent in cesium.)