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Question

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
$λ = \frac{h}{m v}$
$λ \propto \frac{1}{m}$
$β$ particle has least mass.
So $β$ particle has the longest wavelength.

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