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 :

Question

Dr. Abubacker · Accepted Answer

[Solution from source] Maximum kinetic energies are 1 − 0.5 = 0.5 eV and 2.5 − 0.5 = 2 eV, a ratio of 1 : 4. Speed goes as √KE, so the speeds are in the ratio 1 : 2; 1 : 4 is the energy ratio, not the speed ratio. Answer (2).

Q. 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 :

Explanation

Reviewed by Dr. Abubacker

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