(b) Let Rbe the rate of photon production for the 700 nm lamp. Then, RPhc==×⋅=×−λ700400160 101240141 101921nmJ / sJ / eVeV nmphoton / s.bgbgchbg.. 7. (a) Let Rbe the rate of photon emission (number of photons emitted per unit time) and let Ebe the energy of a single photon. Then, the power output of a lamp is given by P = REif all the power goes into photon production. Now,
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