The stopping potential for a certain photocell is 1.2 V when light of wavelength `lambda_(1)=400` nm is used. It is 0.6 V, when light of wavelength `lambda_(2)=500` nm is used. What would be the stopping potential, when both `lambda_(1)` and `lambda_(2)` are incident simultaneously ?

Options

A. 0.9 V
B. 1.8 V
C. 0.6 V
D. 1.2 V

Answer

D

Explanation

As both `lambda_(1)` and `lambda_(2)` are incident, to stop `lambda_(1)1.2V` is needed.