A hydrogen molecule and helium atom are moving with the same velocity. Then the ratio of their de Brogile wavelength is

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1:1

1:27

2:1

2:3

answer is C.

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Detailed Solution

λ=hmvGiven velocity is a constantλ∝1mλH2λHe=mHemH2mass of H2 molecule = 2 unitsmass of He atom = 4 unitsλH2λHe=42λH2:λHe=2:1

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