A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

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The Answer of A small gas laser of the type used in classrooms may radiate light at a power level of 2.0 mW. If the wavelength of the laser light is 642 nm, how many photons does it emit per second? (c = 3.0 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

A Small Gas Laser of the Type Used in Classrooms