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A particle A of mass m and initial velocity v collides with a particle of mass `m//2` which is at rest. The collision is head on, and elastic. The ratio of the de-broglie wavelength `lambda_(A) and lambda_(B)` after the collision is

A

`(lambda_(A))/(lambda_(B))=(1)/(2)`

B

`(lambda_(A))/(lambda_(B))=(1)/(3)`

C

`(lambda_(A))/(lambda_(B))=2`

D

`(lambda_(A))/(lambda_(B))=(2)/(3)`

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The correct Answer is:
C
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