The work function for caesium atom is l.9eV. Calculate the threshold frequency of the radiation. If the caesium element is irradiated with a wavelength 500 nm

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4.588 x 1014

5.684 x 1012

4.624 x 108

5.245 x 1011

answer is A.

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Detailed Solution

If threshold frequency =v0 and threshold wavelength =λ0 then, W0=hv0 ∴ v0=W0h=1.9×1.6×10−19J6.626×10−34Js=4.588×1014s−1

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