A molecule of mass m of an ideal gas collides with the wall of the vessel with the velocity v and returns back with the same velocity. The change in the linear momentum of the molecule will be:
4mv
8mv
2mv
−2mv
A
4mv
B
8mv
C
2mv
D
−2mv
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Solution
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Initial momentum =mv
Final momentum =−mv
Change in momentum =−mv−(mv)=−2mv
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