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COMEDK2015PhysicsCenter of Mass, Momentum and Collision

If the surface is a perfect reflector, then the change in momentum of the wave after falling on the surface is

Options

  1. Ap
  2. B2 p
  3. Cp 2
  4. D-2 p

Correct answer

D. -2 p

Step-by-step solution

p is the momentum of incident wave. Momentum of reflected wave after reflecting from perfect reflector =-p Change in momentum = Final momentum - Initial momentum =-p-p=-2 p

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