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15 April, 00:26

1. Calculate the wavelength (in nm) of the red light emitted by a barcode scanner

that has a frequency of

4.62 x 1014 5-1.

649.4 nm

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Answers (1)
  1. 15 April, 00:35
    0
    6.49 * 10⁻⁷ m (or) 649 nm

    Explanation:

    Wavelength and Frequency are inversely proportional to each other. Greater the wavelength smaller the frequency and vice versa.

    Solution:

    The relation between wavelength and frequency is as follow,

    υ = c / λ

    where

    υ = frequency = 4.62 * 10¹⁴ s⁻¹

    c = velocity of light = 3.0 * 10⁸ ms⁻¹

    λ = wavenumber = ?

    Solving above equation for λ.

    λ = c / υ

    Putting the given values,

    λ = 3.0 * 10⁸ ms⁻¹ / 4.62 * 10¹⁴ s⁻¹

    Result:

    λ = 6.49 * 10⁻⁷ m (or) 649 nm
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