Physics · Atomic Physics

JEE Main 2024 — 31 January, Shift 2 — Question 39

In a photoelectric effect experiment a light of frequency 1.5 times the threshold frequency is made to fall on the surface of photosensitive material. Now if the frequency is halved and intensity is doubled, the number of photo electrons emitted will be:

Option A:
Doubled
Option B:
Quadrupled
Option C:
Zero
Correct
Option D:
Halved

Answer: C

Step-by-step solution

Since $\frac{\mathrm{f}}{2}<\mathrm{f}_{0}$ i.e. the incident frequency is less than threshold frequency.

Hence there will be no emission of photoelectrons. $\Rightarrow$ current $=0$

Answer key and solution verified before publishing.

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Exam: JEE Main 2024
Paper: 31 January, Shift 2
Subject: Physics
Chapter: Atomic Physics
Topic: Photoelectric Effect