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Calculate the value of A. A= (E1,2)/(...

Calculate the value of A.
`A= (E_1,2)/(2E_(2,1)) ` Where `E_(n,z) `= Energy of electron in `n^(th)` orbit , Z = atomic number of hydrogen like specie.

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