The wavelength of red light emitted by a 301-mw helium-neon
The wavelength of red light emitted by a 3.01-mW helium-neon laser is 626 nm. If the diameter of the laser beam is 1.11 mm, what is the density of photons in the beam? Assume that the intensity is uniformly distributed across the beam.
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the wavelength of red light emitted by a 301-mw helium-neon laser is 626 nm if the diameter of the laser beam is 111 mm
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