Question

In photoelectric effect, the stopping potential depends on:

• A. Intensity of light
• B. Frequency of incident light
• C. Work function only
• D. Both frequency and work function

Hint:

Remember the formula: $eV_{0} = h\nu - W$. It clearly shows dependence on both terms.

Answer 1

The Correct Option is D

Step 1: Concept
Einstein's photoelectric equation is $eV_{0} = h\nu - \Phi$, where $V_{0}$ is the stopping potential, $\nu$ is the frequency, and $\Phi$ is the work function.

Step 2: Meaning
Stopping potential is the negative potential required to stop the fastest-moving photoelectrons.

Step 3: Analysis
The equation shows $V_{0}$ is a function of the incident frequency ($\nu$) and the material's specific work function ($\Phi$). It does not depend on the intensity of light.

Step 4: Conclusion
Consequently, the stopping potential is determined by both the energy of the incoming photons and the energy barrier of the metal surface. Final Answer: (D)