Will photo electron be emitted by a copper surface, whose threshold wavelength is 2800 A° when illuminated by visible light ?
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As the wavelength does not lie in the visible range i.e. (4000 - 7500 Aº) so,
it can not emit electrons from the copper surface.
Explanation:
The threshold wavelength λo related to work function is given by:
E = hc / λ
The wavelength = 2800 Aº
Work function "W" = h c / λo
W = 12400 / 2800
W = 4.4 e V
The value of work function is 4.4 e V
Moreover the wavelength does not lie in the visible range i.e. (4000 - 7500 Aº) thus it can not emit electrons from the copper surface.
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