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JEE Main 2017 Physics question

PhysicsDual Nature of Matter and RadiationJEE Main 2017

A particle A of mass m and initial velocity v collides with a particle B of mass which is at rest. The collision is head on, and elastic. The ratio of the de-Broglie wavelengths to after the collision is -

Answer: (B)

Solution

After the elastic collision and , so $ =

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Question ID VK-008961