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Question

A particle of mass m is projected from ground with velocity u making angle θ with the vertical. The de Broglie wavelength of the particle at the highest point is
  1. h/mu
  2. h/musinθ
  3. h/mucosθ

A
h/mucosθ
B
C
h/musinθ
D
h/mu
Solution
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De Broglie wavelength is given by: λ=hmv

At the highest point, only the horizontal component of the velocity will be there, which is usinθ.

Thus, wavelength is given by, λ=hmusinθ

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