NEET2021Physics-Electromagnetic Waves
NEET 2021 Physics Photon Energy MCQ Question
Type: MCQ-numerical-Easy-Class 12
The number of photons per second on an average emitted by the source of monochromatic light of wavelength 600 nₘ, when it delivers the power of 3.3 × 10⁻³ watt will be : (h = 6.6 × 10⁻³⁴ Js)
A
10¹⁸
B
10¹⁷
C
10¹⁶
D
10¹⁵
Correct Answer
Option C
Detailed Explanation
The energy of one photon is given by E = hc/λ. The number of photons per second is power divided by the energy of one photon. Substituting the values, we find the number of photons is 10¹⁷.
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