\(=0.1\, {sec} \cdot \times 10^{-3} \,\frac{{J}}{{s}}\)

\(=10^{-4}\, {~J}\)

If \('n'\) photons of \(\lambda=1000\, {~nm}\) are emitted,

\(\text { then ; } 10^{-4}={n} \times \frac{{hc}}{\lambda}\)

\(\Rightarrow 10^{-4}=\frac{{n} \times 6.63 \times 10^{-34} \times 3 \times 10^{8}}{1000 \times 10^{-9}}\)

\(\Rightarrow {n}=5.02 \times 10^{14}=50.2 \times 10^{13}\)

\(\Rightarrow 50\) (nearest integer)