AIPMT PRELIMS2012Physics-Modern Physics
AIPMT PRELIMS 2012 Physics Photoelectric Effect MCQ Question
Type: MCQ-numerical-Medium-Class 12
Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a photosensitive material. The stopping potential is measured to be 3.57 V. The threshold frequency of the material is
A
2.5 × 10¹⁵ Hz
B
4 × 10¹⁵ Hz
C
5 × 10¹⁵ Hz
D
1.6 × 10¹⁵ Hz
Correct Answer
Option D
Detailed Explanation
Using the photoelectric equation, the threshold frequency is calculated by equating the energy of the incident photons to the work function plus the kinetic energy of the emitted electrons.
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