If moving with equal speeds, the longest wavelength of the following matter waves is that for a (an):

electron

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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 A electron
Electron is the lightest among all the particle
So, the momentum is least for an electron.
$λ = h / P$
So, the longest wavelength is of an electron.

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If travelling at same speeds, which of the following matter waves have the shortest wavelength ?

(a) Electron (b) Alpha particle $(H e^{2 +})$ (c) Neutron (d) Proton

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