Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-numerical-Hard-Class 12
A monochromatic light source of frequency 7.5 × 10^14 Hz emits an average power of 3.0 × 10^-3 W. What is the number of photons emitted per second by this source?
A
6.0 × 10^15 photons/s
B
7.0 × 10^15 photons/s
C
5.0 × 10^15 photons/s
D
4.0 × 10^15 photons/s
Correct Answer
Option A
Detailed Explanation
The energy of each photon can be calculated using E = hν. The number of photons per second is given by N = P/E. Substituting the values, we find N = 6.0 × 10^15 photons/s.
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