Question

Photons of \(5.5\ \mathrm{eV}\) energy fall on the surface of the metal emitting photoelectrons of maximum kinetic energy \(4.0\ \mathrm{eV}\). The stopping voltage required for these electrons is

• A. \(5.5\ \mathrm{V}\)
• B. \(1.5\ \mathrm{V}\)
• C. \(9.5\ \mathrm{V}\)
• D. \(4.0\ \mathrm{V}\)

Hint:

Stopping potential is independent of light intensity and depends only on frequency.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Stopping potential \(V_0\) satisfies \(eV_0 = \mathrm{K.E.}_{\max}\).
Step 2: Detailed Explanation:
\(\mathrm{K.E.}_{\max} = 4\ \mathrm{eV}\)
\(eV_0 = 4\ \mathrm{eV} \rightarrow V_0 = 4\ \mathrm{V}\)
Step 3: Final Answer:
Stopping voltage is 4.0 V.