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24 September, 04:42

A laser produces 20.0 mW of red light. In 1 hour, the laser emits 2.29 X 10^20 photons. What is the wavelength of the laser?

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  1. 24 September, 07:09
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    Using Planck's equation,

    E = nhc / λ

    Also, Power = Energy / time

    E = 20 x 10⁻³ x 60 x 60

    E = 108 J

    108 = (2.29 x 10²⁰ x 6.63 x 10⁻³⁴ x 3 x 10⁸) / λ

    λ = 4.22 x 10⁻⁷ m
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