NEET Practice Questions

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Ultraviolet radiations of 6.2 eV falls on an aluminium surface (work function 4.2 eV ). The kinetic energy in joules of the fastest electron emitted is approximately

(a) 3.2×10-21              (b) 3.2×10-19
(c) 3.2×10-17              (d) 3.2×10-15