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How many photons per second would have to be emitted bye a laser that fires a beam of cross sectional area 3 mm2 perpendicularly at

How many photons per second would have to be emitted bye a laser that fires a beam of cross sectional area 3 mm2 perpendicularly at the wall in order to exert a pressure of 1 atm on the wall? Assume the laser which emits light of wavelength 510 nm . The speed of light is 2.99792 108 m/s and Planck's constant is 6.62607 1034 J s.

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