NEET2026Physics-Photoelectric Effect
NEET 2026 Physics Threshold Wavelength MCQ Question
Type: MCQ-numerical-Medium-Class 12
For a metal of work function 6.6 eV, which of the following wavelengths of incident radiation does not give rise to the photoelectric effect? (Take Planck’s constant as 6.6 × 10⁻³⁴ J s)
A
100 nₘ
B
150 nₘ
C
200 nₘ
D
50 nₘ
Correct Answer
Option C
Detailed Explanation
For incident radiation having wavelength (λ), photoelectric effect doesn’t occur when hc/λ < work-function. Calculating for λ, we find that 200 nₘ does not satisfy the condition for photoelectric emission.
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