Q. A photosensitive metallic surface has work function . If photon of energy 3 fall on this surface, the electron comes out with a maximum velocity of .
When the photon energy is increased to 9 , there maximum velocity of photoelectron will be

 2316  233 J & K CETJ & K CET 2011Dual Nature of Radiation and Matter Report Error

Solution:

The relation between the energy and the work function of the electron is given as:

For the total energy of , the expression can be written as:


Now, the energy provided is So, it can be written as:


Substitute the value of .