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A single electron orbits around a stationary nucleus of charge +Ze. It requires 47.2 eV to excite the electron from the `2^"nd"` to `3^"rd"` Bohr orbit. Find atomic number 'Z' of atom .

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The correct Answer is:
5
`DeltaE_(2rarr3)=4.7eV" "rArr" "13.6Z^(2)((1)/(4)-(1)/(9))=47.2" "rArr" "Z^(2)=(47.2)/(13.6)xx(36)/(5)`
`rArr" "Z^(2)=25" "rArr" "Z=5`
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