Question:
The maximum kinetic energy of photoelectrons coming out of a metal surface is \(10 \, \text{eV}\). The minimum voltage required to stop the emission of electrons from this metal surface is:
The maximum kinetic energy of photoelectrons coming out of a metal surface is \(10 \, \text{eV}\). The minimum voltage required to stop the emission of electrons from this metal surface is:
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Stopping potential is always negative because it opposes electron motion.
Updated On: Apr 16, 2026
- \(10 \, V\)
- \(5 \, V\)
- \(-5 \, V\)
- \(-10 \, V\)
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Concept:
Stopping potential is related to maximum kinetic energy:
\[
K_{\max} = eV_0
\]
Step 1: Given data.
\[ K_{\max} = 10 \, \text{eV} \]
Step 2: Relation.
\[ V_0 = \frac{K_{\max}}{e} = 10 \, V \]
Step 3: Sign convention.
Stopping potential is negative (retarding potential). \[ \therefore V_0 = -10 \, V \]
Step 1: Given data.
\[ K_{\max} = 10 \, \text{eV} \]
Step 2: Relation.
\[ V_0 = \frac{K_{\max}}{e} = 10 \, V \]
Step 3: Sign convention.
Stopping potential is negative (retarding potential). \[ \therefore V_0 = -10 \, V \]
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