NEET Physics Photon Energy MCQ Question with Solution

A monochromatic light of frequency $3 \times 10^{14} \text{ Hz}$ is produced by a LASER, emits the power of $3 \times 10^{-3} \text{ W}$ . Find how many number of photons are emitted per second.

A

$5 \times 10¹⁶$

B

$5 \times 10¹⁶$

C

$5 \times 10¹⁶$

D

$8.5 \times 10¹⁶$

Correct Answer

Option A

Detailed Explanation

Using the formula $E = hf$ , the energy per photon is calculated. The number of photons is $\frac{P}{E} = 1.5 \times 10^{16}$ .

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