Calculate the Wavelength of Light Emitted When an Electron in a He⁺

Calculate the wavelength of light emitted when an electron in a He⁺ ion goes from the n = 5 shell to the n = 2 shell.

A) 2.30×10⁶ m
B) 4.34×10 ^{- 7} m
C) 1.08×10 ^{- 7} m
D) 1.52×10 ^{- 7} m
E) none of these