The anode vollage of a photocell is kept fixed . The wavelength `lambda `of the light falling on the cathode varies as follows

Options

A.
B.
C.
D.

Answer

d

Explanation

As the wavelength `lambda` of the incident light falling on cathode is gradually increased, there will be a value of `lambda` above which the photoelectric emission will stop. I.e., the photoelectric emission will stop. i.e, the photoelectric current will become zero. As `lambda` is decreased, the energy of the incident photons increases `(E=hc//lambda)`. Due to it, more number of photons will be successful in ejecting the electrons from the surface of cathode. As a result of it, the photoelectric current increases, i.e., `I prop 1//lambda` Thus, option (d) is true.