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Work function of some metals are given below
Metal → Li K Fe Cu
W₀(ev)→ 2.42 2.25 4.7 4.8
The number of metals which will show photoelectric effect when light of 300 nm wavelength falls on the given metal is.

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Li and Cu only

K and Fe only

Fe and Cu only

Li and K only

answer is A.

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Detailed Solution

Energy in eV = 12400/wavelength (in 0A)
E = 12400/3000 = 4.13eV
As the energy of incident radiation in 4.13eV, the metals whose work function is less than 4.13eV will observe photo electric effect. i.e.. Li and K.

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