Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is __________.

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Solution

Q.
Number of photons of equal energy emitted per second by a 6 mW laser source operating at 663 nm is __________.

$(G i v e n : h = 6.63 \times 10^{- 34} J \cdot s a n d 𝑐 = 3 \times 10^{8} m / s)$ [2026]

1 $2 \times 10^{16}$

2 $5 \times 10^{16}$

3 $5 \times 10^{15}$

4 $10 \times 10^{15}$

Ans.
(1)

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