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Work function values of five metals are 2 ev/atom, 2.5 ev/atom, 3.8 ev/atom, 5 ev/atom, 6 ev/atom respectively. If the wavelength of incident radiation is 400nm. How many metals show Photoelectric effect

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answer is B.

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Detailed Solution

$E (incident) = \frac{1240}{400} e v$
= 3.1 ev
Two metals have their work function lesser than incident energy , only they show photoelectric effect

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