Physics · Atomic Physics
JEE Main 2026 — 4 April, Morning Shift — Question 7
The graph shows variation of stopping potential V₀ with frequency ν for three photosensitive metals X₁, X₂ and X₃. Which metal will give out electrons with greater kinetic energy for the same wavelength of incident radiation?
- Option A:Correct
X₁
- Option B:
X₂
- Option C:
X₃
- Option D:
All metals give same KE
Answer: A
Step-by-step solution
Kinetic energy = hν - φ. For same wavelength (same ν), smaller work function gives larger KE. From graph, X₁ has smallest threshold frequency ⇒ smallest φ ⇒ largest KE
Answer key and solution verified before publishing.
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- Exam
- JEE Main 2026
- Subject
- Physics
- Chapter
- Atomic Physics
- Topic
- Photoelectric Effect