The longest and shortests wavelengths of the Lyman series of singly ionized Helium

Answer 1

http://en.wikipedia.org/wiki/Lyman_series

Answer 2

1/4 of the corresponding wavelengths for hydrogen. The shortest wavelength will be the series limit.

The Lyman alpha line of H is at 121.6 nm

Answer 3

Ignore my post, Miss X, I didn't read the question. Duh.

Answer 4

Find the wave length of the first line of the series that corresponds to the Lyman series in a single ionized helium atom where the helium nucelus is four times of the hydrogen nucelus and the change of the helium nucelus is four times of the hydrogen nucelus