Question

Ultraviolet radiations of 6.2 eV falls on an aluminium surface. Kinetic energy of fastest electron emitted is (work function = 4.2 eV)

(a) 3.2 x 10^-21 J

(b) 3.2 x 10^-19 J

(c) 7 x 10^-25 J

(d) 9 x 10^-32 J

Answer 1

The correct option is (b) 3.2 x 10^-19 J.

Explanation:

Kinetic energy of fastest electron