Pin=ηextiehfP_{in} = η_{ext}\frac{i}{e}hfPin=ηexteihf
Number of photons =Pinhf=ηextie= \frac{P_{in}}{hf} = η_{ext}\frac{i}{e}=hfPin=ηextei
Number of photons =0.8×5×10−31.6×10−19= 0.8 \times \frac{5 \times 10^{-3}}{1.6 \times 10^{-19}}=0.8×1.6×10−195×10−3
Number of photons =2.5×1016= 2.5 \times 10^{16}=2.5×1016
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