When light of wavelength λ is incident on a photosensitive surface, the stopping potential is V . When light of wavelength 3 λ is incident on same surface, the stopping potential is V /6 . Threshold w

Question

When light of wavelength λ is incident on a photosensitive surface, the stopping potential is V . When light of wavelength 3 λ is incident on same surface, the stopping potential is V /6 . Threshold wavelength for the surface is

TestHub · Accepted Answer

Using Einstein's photoelectric equation
From eqns. (i) and (ii), $\frac{h c}{λ _{0}} - \frac{6 h c}{λ _{0}} = \frac{h c}{λ} - \frac{6 h c}{3 λ} \Rightarrow \frac{h c}{6 λ} = \frac{5 h c}{6 λ _{0}} or λ_{0} = 5 λ$

Physics - Modern Physics Question with Solution | TestHub

Options:

Doubts & Discussion