NEET2015Physics-Modern Physics
NEET 2015 Physics Photoelectric Effect MCQ Question
Type: MCQ-numerical-Hard-Class 12
A certain metallic surface is illuminated with monochromatic light of wavelength λ₁. The stopping potential for photo-electric current for this light is 3V₀. If the same surface is illuminated with light of wavelength 2λ₁, the stopping potential is V₀. The threshold wavelength for this surface for photoelectric effect is
A
6λ₁
B
4λ₁
C
λ₁/4
D
λ₁/6
Correct Answer
Option A
Detailed Explanation
Using the photoelectric equation , and solving for the threshold wavelength, we find it to be 6λ₁.
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