Question:
Which of the following conclusion is correct regarding photoelectric effect?
Which of the following conclusion is correct regarding photoelectric effect?
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Frequency controls energy, intensity controls number of electrons.
Updated On: Apr 17, 2026
- Energy of a photon depends upon frequency of light absorbed.
- Energy of a photon depends upon intensity of light.
- Kinetic energy of electrons increases due to increase in intensity of light.
- All the energy of photon is absorbed by metal surface.
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The Correct Option is A
Solution and Explanation
Concept:
Energy of photon:
\[
E = h\nu
\]
Step 1: Energy depends only on frequency: \[ E \propto \nu \]
Step 2: Intensity affects number of electrons emitted, not their energy.
Step 3: Thus:
•(A) Correct
•(B) Wrong (independent of intensity)
•(C) Wrong (KE depends on frequency)
•(D) Incorrect statement
Step 1: Energy depends only on frequency: \[ E \propto \nu \]
Step 2: Intensity affects number of electrons emitted, not their energy.
Step 3: Thus:
•(A) Correct
•(B) Wrong (independent of intensity)
•(C) Wrong (KE depends on frequency)
•(D) Incorrect statement
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