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Q.

A hydrogen like species with atomic number 'Z' is · higher excited state 'n' and emits photons of energy 25. 7 and 8. 7 e V when making a transition to 1st and 2nd excited state respectively. Calculate value of 'n'.

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answer is 5.

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Detailed Solution

It is known that

13.6Z2122−1n2=25.713.6Z2132−1n2=8.7⇒Z=3,n=5

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