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16 April, 16:12

If the line spectrum of lithium has a red line at 670.8 nm. How much energy does a a photon with this wavelength have?

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  1. 16 April, 16:39
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    We already know the formula for finding the energy of a photon with this wavelength as:

    E = ħc / λ

    The information's that we already know are:

    h = Plancks constant

    = 6.626x10^-34 Js

    c = light speed

    = 2.999x10^8 m/s

    λ = Wavelength of the light as given in the question

    = 670.8x10^-9 m

    E = amount of energy

    Then

    E = (6.626x10^-34) * (2.999x10^8) / (670.8x10^-9)

    = 2.962x10^-19 J
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