The number of photons emitted by a 5mW laser source operating at 632.8 nm is ? × 10 16

Question

The number of photons emitted by a 5mW laser source operating at 632.8 nm is ?   ×      10          16

revessatrP6 · Accepted Answer

Every photon&#039;s energy is  =  E            h      c        λ    =            (      6.63      ×              10                  −          34                    J      s      )      ×      (      3      ×              10        8            m              s                  −          1                    )              (      632.8      ×              10                  −          9          m                    )        =  3.14  ×      10          −      19        JThe laser&#039;s energy output per second is   5  ×      10          −      3        JConsequently, the rate of photon emission per second  =            5      ×              10                  −          3                    J              3.14      ×              10                  −          19                    J        =  1.6  ×      10          16        .

The number of photons emitted by a 5mW laser source operating at 632.8 nm is __times 10^{16}

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