(Nearest integer)
$\left(\mathrm{h}=6.63 \times 10^{-34}\, \mathrm{Js}, \mathrm{c}=3.00 \times 10^{8} \,\mathrm{~ms}^{-1}\right)$
$=0.1\, \mathrm{sec} \cdot \times 10^{-3} \,\frac{\mathrm{J}}{\mathrm{s}}$
$=10^{-4}\, \mathrm{~J}$
If $'n'$ photons of $\lambda=1000\, \mathrm{~nm}$ are emitted,
$\text { then ; } 10^{-4}=\mathrm{n} \times \frac{\mathrm{hc}}{\lambda}$
$\Rightarrow 10^{-4}=\frac{\mathrm{n} \times 6.63 \times 10^{-34} \times 3 \times 10^{8}}{1000 \times 10^{-9}}$
$\Rightarrow \mathrm{n}=5.02 \times 10^{14}=50.2 \times 10^{13}$
$\Rightarrow 50$ (nearest integer)
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