In hydrogen spectrum `L_(alpha)` line arises due to transition of electron from the orbit n=3 to the orbit n=2. In the spectrum of singly ionized helium there is a line having the same wavelength as that of the `L_(alpha)` line. This is due to the transition of electron from the orbit:

Options

A. n = 3 to n = 2
B. n = 4 to n = 2
C. n = 5 to n = 3
D. n = 6 to n = 4

Answer

D