Moving with the same velocity, one of the following has the longest de Broglie wavelength

proton

α−particle

β−particle

neutron

A

α−particle

B

β−particle

C

proton

D

neutron

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Solution

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De-broglie wavelength

λ=hmv

λ∝1m

β particle has least mass.

So β particle has the longest wavelength.

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