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  4. Number of photons having wavelength 632.8 nm, emitted by 5 mW laser source in 1 second is

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Q. Number of photons having wavelength $632.8 \,nm$, emitted by $5\, mW$ laser source in $1$ second is

NTA AbhyasNTA Abhyas 2022

Solution:

$E=\frac{n h c}{\lambda }$
$5\times 10^{- 3} \, J / s=n\times \frac{1240}{632.8}\times 1.6\times 10^{- 19} \, J$
$n=1.6\times 10^{16}$