NEET Questions Solved


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

(b) KmaxeV=EeV-W0eV=6.2-4.2=2 eV KmaxJoules=2×1.6×10-19 J=3.2×10-19 J

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