The frequency of light emitted for the transition n = 4 to n = 2 of He+ is equal to the transition in H atom corresponding to which of the following?
n = 4 to n = 3
n = 3 to n = 1
n = 2 to n = 1
n = 3 to n = 2
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An element has 2 electrons in K shell, 8 electrons in L shell, 13 electrons in M shell and one electron in N shell. The element is