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>> $Moving with the same velocity, one of th$

Question

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

A

$β -$ particle

B

$α -$ particle

C

proton

D

neutron

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Solution

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Correct option is A)

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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