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22 November, 03:43

A laser pulse with wavelength 520 nm contains 4.40 mj of energy. how many photons are in the laser pulse?

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  1. 22 November, 07:14
    0
    Given:

    λ = 520 nm = 520 x 10⁻⁹ m, the wavelength

    E = 4.4 mJ = 4.4 x 10⁻³ J, energy per packet or pulse

    The Planck-Einstein equation is

    E = (hc) / λ

    where

    c = 3 x 10⁸ m/s, the velocity of light

    The energy per photon is

    e = fh

    where

    f = c/λ = 3 x 10⁸/520 x 10⁻⁹ = 5.7692 x 10¹⁴ 1/s

    The number of photons is

    E/e = c / (fλ)

    = (3 x 10⁸) / [ (5.7692 x 10¹⁴) * (520 x 10⁻⁹) ]

    = 1

    Answer: 1
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