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An alpha particle, a proton and an elect...

An alpha particle, a proton and an electron are moving with equal kinetic energy. Which one of these particles has the longest de Broglie wavelength? Give reason.

Text Solution

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de Broglie wavelength `lambda=(h)/(sqrt(2mk))`
`implieslambdaprop(1)/(sqrt(m)` for equal kinetic energy)
Electron has the longest de Broglie wavelength because it has least mass.
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