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  4. Which of the following has the largest de-Broglie wavelength, given that all have equal velocity?

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Q. Which of the following has the largest de-Broglie wavelength, given that all have equal velocity?

BITSATBITSAT 2011

Solution:

$\lambda=\frac{ h }{ mv }$
For same velocity,
$\lambda \propto 1 / m$
Electron has the least mass,
so its wavelength is maximum.