1.

The kinetic energy of a α-particle to move from the points where potential have 70 V to 50 V from rest is:(a) 20 eV(b) 40 eV(c) 20 MeV(d) 40 MeV

Answer»

(b) 40 eV
Work done W = qV
W = (2e)[VB – VA]
= (2e) [20] volt or
W = 40 eV



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