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Q: 11.4 (b) Monochromatic light of wavelength is produced by a helium-neon laser. The power emitted is
.
How many photons per second, on the average, arrive at a target irradiated by this beam? Assume the beam to have uniform cross-section which is less than the target area),
Answers (1)
Power of the light beam, P =9.42 mW
If n number of photons arrive at a target per second nE=P (E is the energy of one photon)
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