Question

A proton is about 1840 times heavier than an electron. When it is accelerated by a potential difference of 1 kV its kinetic energy will be

(a) 1840 keV

(b) (1/1840) keV

(c) 1 keV

(d) 920 keV

Answer 1

The correct option is (c) 1 keV.

Explanation:

The charge on a proton is equal to e, the electronic charge. The potential difference is V = 1 kV. Hence the kinetic energy of the proton is E = 1 keV.