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Question

Which of the following has the largest de Broglie wavelength assuming that the velocity is the same for all?

A
CO2 molecule
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B
NH3 molecule
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C
electron
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D
proton
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Solution

The correct option is C electron
According to de Broglie equation,
λ=hmv
where λ, v, h and m are wavelength, velocity, Planck's constant and mass of a particle respectively.

As velocity is the same for all the particles/molecules.
λ 1m
As the mass of the electron is least, so the electron has the largest wavelength.

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