The de Broglie wavelength of a proton and α -particle are equal. The ratio of their velocities is

The de Broglie wavelength of a proton and α-particle are equal. The ratio of their velocities is
  1. 4:1
  2. 4:3
  3. 1:4
  4. 4:2

Solution

λ=hmv

λp=λα

mPVP=mαvα

mPvP=4 mpvα mα=4 mP

vpvα=4

Asked in: JEE Main 2021 (24 Feb Shift 2)

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