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An alpha-particle of mass m suffers 1-di...

An alpha-particle of mass m suffers `1`-dimentinal eleastic collision with a nucleus at rest of unknown mass. It is scattered directly backwards losing `64%` of its initial kinetic energy. The mass of the nucleus is :

A

2 m

B

3.5 m

C

1.5 m

D

4 m

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The correct Answer is:
A

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