23. How many photons are emitted per second by a 5 mW laser source operating at 632.8 nm?
karthik , 7 Years ago
Grade 12
Wave Optics> 23. How many photons are emitted per seco...
1 Answers
Arun
Last Activity: 7 Years ago
the energy of each photon is =
E = hc / 
= 6.63 * 10 –34 * 3 * 108 / 632.8 * 10 –9
= 3.14 * 10 –19 J
the energy emitted per second by the laser is = 5 * 10 –3 J
hence totla no. of photons emitted per second = 5 * 10 –3 J / 3.14 * 10 –19 J
= 1.6 * 1016
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