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Physics · PYQ NEET UG 2021
हिन्दीThe number of photons per second on an average emitted by the source of monochromatic light of wavelength \( 600\text{ nm} \), when it delivers the power \( 3.3 \times 10^{-3}\text{ watt} \) will be: \( (h = 6.6 \times 10^{-34}\text{ Js)} \)
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Correct answer · Option B
\( 10^{16} \)
Explanation
Power \( P = n \frac{hc}{\lambda} \implies n = \frac{P \lambda}{hc} = \frac{3.3 \times 10^{-3} \times 600 \times 10^{-9}}{6.6 \times 10^{-34} \times 3 \times 10^8} = 10^{16} \).
