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23. How many photons are emitted per second by a 5 mW laser source operating at 632.8 nm?
the energy of each photon is = E = hc / = 6.63 * 10 –34 * 3 * 108 / 632.8 * 10 –9 = 3.14 * 10 –19 Jthe energy emitted per second by the laser is = 5 * 10 –3 Jhence totla no. of photons emitted per second = 5 * 10 –3 J / 3.14 * 10 –19 J = 1.6 * 1016
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