Q. 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 $3.3 \times 10^{-3}$ watt will be: (h = $6.6 \times 10^{-34}$ Js)

A) $10^{17}$
B) $10^{16}$
C) $10^{15}$
D) $10^{18}$
Explanation

[Solution] $n = \frac{P\lambda}{hc} = \frac{3.3 \times 10^{-3} \times 6 \times 10^{-7}}{6.6 \times 10^{-34} \times 3 \times 10^8} = 10^{16}$ per second. Answer (2).

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.

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