Question

Given below are two statements :
Statement I: Stopping potential in photoelectric effect does not depend on the power of the light source
Statement II: For a given metal, the maximum kinetic energy of the photoelectron depends on the wavelength of the incident light.
In the light of above statements, choose the most appropriate answer from the options given below

• A. Both Statement I and Statement II are incorrect
• B. Statement I is correct but statement II is incorrect
• C. Both Statement I and statement II are correct
• D. Statement I is incorrect but statement II is correct

Answer 1

The Correct Option is C

Stopping potential $V_S=\frac{K{E}_{\max }}{e}$
$V_S=\frac{\frac{hC}{\lambda }-\varphi }{e}$
Stopping potential does not depend on intensity or power of light used, it only depends on frequency or wavelength of incident light.
So both statements I and II are correct

Answer 2

Statement I: True. The stopping potential in the photoelectric effect depends on the frequency (or wavelength) of the light, rather than its intensity or power.
Statement II: True. The maximum kinetic energy of the emitted photoelectrons is given by the equation: \[ KE_{\text{max}} = \frac{hc}{\lambda} - \phi \] where \( \lambda \) is the wavelength of the incident light and \( \phi \) is the work function of the metal.
Both statements are accurate and correctly reflect the principles of the photoelectric effect.