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A particle or mass m is moving with spee...

A particle or mass m is moving with speed u in a direction in a which makes `60^(@)` with respect to x axis to x axis . It undergoes elastic collision with the well . What is the change in momentum in x and y direction?

A

`Deltap_(x)`=-mu ,`Deltap_(y)`=0

B

`Deltap_(x)`=-2mu, `Deltap_(y)`=0

C

`Deltap_(x)`=0,`Deltap_(y)`==mu,`Deltap_(y)`=0

D

`Deltap_(x)`=mu,`Deltap_(y)`=0

Text Solution

Verified by Experts

The correct Answer is:
b
The change in momentum of the moleculein x direction
`Deltap_(x)`=final momentum - collision =-mu-mu=-2mu
The change in momentum of the molecule in Y direction `Deltap_(y)=0`
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