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Q.

Work functions of five metals A, B, C, D and E are 3.7 eV, 2.25 eV, 4.8 eV, 4.3 eV and 2.43 eV respectively. If a radiation of wavelength $4000 A^{o}$ is incident on these metals in separate experiments, how many of them show photoelectric effect.

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a

1

b

4

c

2

d

3

answer is B.

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Detailed Solution

$E = \frac{h c}{λ} = \frac{12400}{4000} = 3.1$

So metal of work function 3.1 or lesser than 3.1 will show photoelectric effect.

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Work functions of five metals A, B, C, D and E are 3.7 eV, 2.25 eV, 4.8 eV, 4.3 eV and 2.43 eV respectively. If a radiation of wavelength 4000Ao is incident on these metals in separate experiments, how many of them show photoelectric effect.