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Five metals have their work function values as 4 eV/atom , 5.6 eV/atom, 3 eV/atom, 8 eV/atom and 7 eV/atom. How many of these metals can show photoelectric effect when each one of them is bombarded with a radiation of wavelength, 200 nm ?

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a

3

b

1

c

2

d

4

answer is A.

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Detailed Solution

Energy of incident radiation eV/atom =1240λ(nm)=1240200=6.2 eV/atom ;Photo electric effect is observed only when work function of metal is lesser than the energy of incident radiation.

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Five metals have their work function values as 4 eV/atom , 5.6 eV/atom, 3 eV/atom, 8 eV/atom and 7 eV/atom. How many of these metals can show photoelectric effect when each one of them is bombarded with a radiation of wavelength, 200 nm ?