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Q.

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

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a

CO2​ molecule

b

Proton

c

NH3​ molecule

d

Electron

answer is D.

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Detailed Solution

λ =hmv
For same velocity, 

λ∝1/m
Electron has the least mass, so its wavelength is maximum.

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