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Note:
If your answer is options 2,4 Then you have to fill the OMR sheet as ‘24’
If your answer is options 1,3,4 Then you have to fill the OMR sheet as ‘134’

If electron of the hydrogen atom is replaced by another particle of same charge but of double the mass, then:
1) Bohr radius will increase
2) Ionisation energy of the atom will be doubled
3) Speed of the new particle in a given state will be lesser than the electron’s speed in same orbit
4) Gap between energy levels will now be doubled

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answer is 24.

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Detailed Solution

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$E \propto m a n d r \propto \frac{1}{m}$

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Note:If your answer is options 2,4 Then you have to fill the OMR sheet as ‘24’If your answer is options 1,3,4 Then you have to fill the OMR sheet as ‘134’ If electron of the hydrogen atom is replaced by another particle of same charge but of double the mass, then:1) Bohr radius will increase 2) Ionisation energy of the atom will be doubled3) Speed of the new particle in a given state will be lesser than the electron’s speed in same orbit4) Gap between energy levels will now be doubled