AIPMT PRELIMS2007Physics-Modern Physics
AIPMT PRELIMS 2007 Physics Photoelectric Effect MCQ Question
Type: MCQ-numerical-Medium-Class 12
Monochromatic light of frequency 6.0 × 10¹⁴ Hz is produced by a laser. The power emitted is 2 × 10⁻³ W. The number of photons emitted, on the average, by the sources per second is
A
5 × 10¹⁶
B
5 × 10¹⁷
C
5 × 10¹⁴
D
5 × 10¹⁵
Correct Answer
Option A
Detailed Explanation
The energy of a photon is given by E = hf, where h is Planck's constant and f is the frequency. The number of photons per second is the power divided by the energy per photon. Calculating gives approximately 5 × 10¹⁶ photons per second.
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