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A slow moving electron collides elastica...

A slow moving electron collides elastically with a hydrogen atom at rest. The initial and final motions are along the same straight line. What fraction of electron's kinetic energy is transferred to the hydrogen atom? The mass of hydrogen atom is 1850 times the mass of electron.

A

`0.217"%"`

B

`2.17"%"`

C

`0.0217"%"`

D

`21.7"%"`

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