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Ultraviolet radiations of 6.2 eV falls on an aluminium surface. K.E. of fastest electron emitted is (work function = 4.2 eV)
(a) 3.2 × 10-21 J
(b) 3.2 × 10-19 J
(c) 7 × 10-25 J
(d) 9 × 10-32 J
(b)
K.E. of fastest electron
= E – W0 = 6.2 - 4.2 = 2.0 eV
= 2 × 1.6 × 10-19 = 3.2 × 10-19 J
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