Determine the wavelength and colour of visible light that contains enough energy to eject an electron...
Determine the wavelength and colour of visible light that contains enough energy to eject an electron off a metal with a work function of 3eV? Take 1 J = 6.24 x 1018 eV and h = 6.63 x 10-34 J.s
Homework Answers
We know that
Energy E =hc/λ
c is the speed of light = 3.00×108m/s
λ is the wavelength
h is the Planck Constant which = 6.63×10−34 J.s
λ = hc / E = 6.63×10−34 J.s * 3.00×108m/s / (3 * 1.6*10-19) = 414 nm
The color is violet since the range of violet is 390 nm to 430 nm
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[Note: The electron volt (eV) is a common energy unit for work
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