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A laser light of 100 watt fires 250 ms pulses of wavelength 680 nm. (a) Calculate the energy of single photon in eV. (b)

 

A laser light of 100 watt fires 250 ms pulses of wavelength 680 nm. (a) Calculate the energy of single photon in eV. (b) How many photons are in the 250 ms pulse?

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