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Physics · Atomic Physics

JEE Main 2025 — 22 January, Morning Shift — Question 55

The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV and 2.5 eV , respectively. If we incident a light of wavelength 550 nm on these two metal surface, then photo-electric effect is possible for the case of

  1. Option A:

    Li only

  2. Option B:

    Cs only

    Correct
  3. Option C:

    Neither Cs nor Li

  4. Option D:

    Both Cs and Li

Answer: B

Step-by-step solution

E=1240λ=1240550≃2.25E=\frac{1240}{\lambda}=\frac{1240}{550} \simeq 2.25

Answer key and solution verified before publishing.

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Exam
JEE Main 2025
Paper
22 January, Morning Shift
Subject
Physics
Chapter
Atomic Physics
Topic
Photoelectric Effect
The work functions of cesium (Cs) and lithium (Li) metals are 1.9 eV… | JEE Main 2025 PYQ with Solution · DhiX AI