ifos • paper_1 • waves_oscillationsifos-2021-subject-02-007
Laser light — UPSC IFoS 2021 Physics PYQ
Buy PYQ Solution Manual →Consider that a continuous laser beam which is assumed to be perfectly monochromatic with a wavelength of 6500\text{ \AA} is chopped into 2\text{ ns} pulses using a shutter. Calculate the number of photons in each pulse, if the power of each pulse is 5\text{ mW}.
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