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The work function ϕ of some metal is listed below. The number of metals which will show photoelectric effect when light of 300nm wavelength fall on the metal is

Correct answer

4

Step-by-step solution

energy of light = 1240 300 = 4.13 e V , so the metal having work function lower than 4.13eV will emit photoelectron, so the following 4 metals will show photoelectric effect

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