Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is:

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Accepted Answer

Correct answer: B. (b) According to Einsten's photoelectric effect, the K.E. of the radiated electrons K E_ max=E-W 12mv_1^2= (1-0.5 ) eV=0.5 eV 12mv_2^2=(2.5-0.5) eV=2 eV v_1v_2= 0.52= 1 4= 12

$Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is:$

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