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Monochromatic light of frequency 6 x10¹⁴Hz is produced by a laser. The power emitted is 2 x 10^-3W. The number of photons emitted per second by source is

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5.0x10¹⁶

5.0 x10¹⁷

5.0x10¹⁵

5.0 x10¹⁸

answer is A.

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Detailed Solution

$\begin{array}{l} P = Nhv \\ 2 \times 10^{- 3} = N \times 6 .625 \times 10^{- 34} \times 6 \times 10^{14} \\ N = \frac{10^{- 3}}{3 \times 6 .6 \times 10^{- 20}} \approx 5 \times 10^{15} \end{array}$

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