ch38-p013 - 13. The rate at which photons are absorbed by...

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abs abs emit 2 (0.80) . 4 A RR r π = Given that 62 abs 2.00 10 m A and 3.00 m, r = with abs 4.000 photons/s, R = we find the rate at which photon is emitted to be () 22 8 emit abs abs 44 ( 3 . 0 0 m ) 4.000 photons/s 2.83 10 photons/s (0.80) (0.80)(2.00 10 m ) r A ππ == = × × . Since the energy of each emitted photon is ph 1240 eV nm 2.48 eV 500nm hc E λ = , the power output of source is
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