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Q.

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

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a

1

b

2

c

3

d

4

answer is B.

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Detailed Solution

$E_{l i g h t} = \frac{h c}{λ} = \frac{1240}{λ (n m)} = \frac{1240}{400} = 3.1 e v$

Metals (A & B) whose ‘W’ values less than 3.1 ev show photoelectric effect

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