In a direct $pm$ junction with internal quantan efficiency of $70\%.$ Assuming that the sample has $N_A=4\mathrm{.}37{10}^{16}c{m}^{-3}$ and $N_0=4\mathrm{.}37{10}^{18}c{m}^3-$here $6\mathrm{.}24{10}^{12}$ electrons recombine with holes every second. The number of emittod photons por second in:

$8\mathrm{.}91{10}^{18}$

$(8)437{10}^{13}$

$3\mathrm{.}01{10}^{16}$

$($d$)6\mathrm{.}24{10}^{14}$