A laser used to weld detached retinas emits light with a wavelength of 652nm in pulses that are 20.0 ms in duration. The average power during each pulse is 0.600 W.
(a) How much energy is in each pulse in joules in electron volts?
(b) What is the energy of one photon in joules in electron volts?
(c) How many photons are in each pulse?
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October 22, 2010

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