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Hertz's Observations

Moving with t...

Question

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

β -

particle

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α -

particle

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proton

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neutron

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Solution

The correct option is C $β -$ particle
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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