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(a) Define the following terms : (i...

(a) Define the following terms :
(i) Threshold frequency (ii) Work function.
(b) The work function for Cs atom is 1 .9 eV. Find threshold wavelength `(lambda_0)` and threshold frequency `(v_0)` of this light radiation. If Cs metal is irradiated with a radiation of wavelength 500 nm find kinetic energy and velocity of emitted electron.

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