Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is ____. (Given: h = 6.63 × 10^–34 Js and c = 3 × 10⁸ m/s)
[JEE Main 2026, 28 Jan (Shift 2)]

Question

Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is ____. (Given: h = 6.63 × 10 –34 Js and c = 3 × 10 8 m/s) [JEE Main 2026, 28 Jan (Shift 2)]

YESPYQ · Accepted Answer

Correct answer: a) 2 × 10 16. $P=\frac{nhC}{\lambda }$ $6\times {10}^{−3}=\frac{n\times 6.63\times {10}^{−34}\times 3\times {10}^{8}}{663\times {10}^{−9}}$ n = 2 $\times$ 10 16 photons

Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is ____. (Given: h = 6.6…

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