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Questions  

The ratio of momenta of an electron and an α-particle which are accelerated from rest by a potential difference of 100 volt is

a
1
b
2memα
c
memα
d
me2mα

detailed solution

Correct option is D

Momentum p=2mK ;   where K= kinetic energy =Q.V ⇒p=2mQV⇒p∝mQ ⇒pepα=meQemαQα=me2mα

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Kinetic energy of an electron accelerated through a potential difference of 100 V is


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