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Find out the value of A from the followi...

Find out the value of A from the following information provided.
`A = (E_(1 ,2))/(2E_(2,1))` where `E_(n,z)` = Energy of electron in nth orbit, Z = atomic of hydrogen like species.

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The correct Answer is:
8
`A=(E_(1.2))/(2E_(2,1))= (-13.6xx2^2xx2^2)/(2xx1^2 xx (-13.6)xx1^2) = 16/2 = 8`
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