When a metallic surface is illuminated with radiation of wavelength , the stopping potential is V. If the same surface is illuminated with radiation of wavelength , the stopping potential is. The threshold wavelength for the metallic surface is:
Conservation of energy -
- wherein
Let threshold wavelength is
Then ---------------(1)
-------------------(2)
---------------(3)
From equation (1) and (2)
or
Option 1)
This is incorrect option
Option 2)
This is incorrect option
Option 3)
This is incorrect option
Option 4)
This is correct option