A laser beam has a power of 1 mw and a diameter of 2257
A laser beam has a power of 1 mW and a diameter of 2.257 millimeter. Find how many photons are emitted per second over an area of 1mm^2, λ =632.8 nm?
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a laser beam has a power of 1 mw and a diameter of 2257 millimeter find how many photons are emitted per second over an
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