Question

MCQ-(plz with explanation)

If an Alpha particle at rest is made to move through a potential difference of v then its kinetic energy will be??

(a) ev

(b)2ev

(c)4ev

(d)8ev.​

Answer 1

Answer:

The correct option is 2ev (b)✅

Explanation:

As charge on alpha particle is = +2e

Work done by field;

W= F.d ( F = 2e × E°)

And E°=V/d

So, W =2eV

Then, if it is accelerated to a potential V, work done by field on particle is 2eV, and as there is no dissipation of energy, all this will be in form of Kinetic energy.

Hence Kinetic energy of the particle will we 2eV

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