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17 June, 07:02

Calculate the energy associated with red light with a wavelength of 725 nm

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  1. 17 June, 07:54
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    Given:

    Wavelength (λ) of red light = 725 nm

    To determine:

    Energy associated with the given wavelength

    Explanation:

    The relation between energy (E) and wavelength (λ) is given as-

    E = hc/λ

    where : h = Planck's constant 6.626 * 10⁻³⁴ Js

    c = speed of light = 3*10⁸ m/s

    E = 6.626*10⁻³⁴ Js * 3*10⁸ ms⁻¹/725*10⁻⁹ m = 2.74*10⁻¹⁹ J

    Ans: Energy associated with a wavelength of 725 nm is 2.72*10⁻¹⁹ J
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