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Question

Using the Heisenberg uncertainty principle arrange the following particles in the order of increasing lowest energy possible.
(I) an electron in H2 molecule
(II) a H atom in a H2 molecule
(III) a proton in the carbon nucleus
(IV) a H2 molecule within a nanotube

A
(I)<(III)<(II)<(IV)
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B
(IV)<(II)<(I)<(III)
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C
(II)<(IV)<(III)<(I)
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D
(IV)<(I)<(II)<(II)
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Solution

The correct option is D (I)<(III)<(II)<(IV)
We know that
nanotude nm106m
Δx 5 more AP minimum P is moles
E=Pv2m5 minimum
So (A) and (cC) are ruled one
H atom is H2 molecule is order of molecular size Δx1 molecular size
electron in H2 molecule
Δx2= atoms size
Δx1>Δx2
E1<E2
Hence option (B)

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