Explain : energy photon energy of electron and no of photons in photoelectric effect.

Explanation

Einstein (1905) was able to explain the photoelectric effect using plank quantum theory of electromagnetic radiation .
Shiming a beam of light on to a metal surface can therefore be viewed as shooting a beam of particle the photons .When a photon of sufficient energy strikes an electron in the atom of the metal it transfers it energy instantaneously to the electron during the collision and the electron is ejected without any time lag or delay
A more intense beam of light consists of larger number of photons consequently the number of electrons ejected is also larger.