Question

A photon of wavelength 4 x 10⁻⁷ m strikes on metal surface, the work function of the metal being 2.13 eV. Calculate: the velocity of the photoelectron (1 ev= 1.6020 x 10⁻¹⁹J).

Answer 1

To calculate the velocity of a photoelectron, we can use a following expression,

 

 

Where ,(  ) is kinetic energy of the emission.

M is the mass of photoelectron

Putting in the formula we get

 

V =  

V = 5.84 X 105 m s-1.

So the answer is 5.84 X 105 m s-1.

This is the velocity of a photoelectron.