What Is the Wavelength of the Emitted Photon If an Electron

Multiple Choice

What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 7 state to the n = 2 state? (c = 3.00 × 10⁸ m/s,h = 6.626 × 10^-34 J ∙ s,1 eV = 1.60 × 10^-19 J)

A) 199 nm
B) 365 nm
C) 4480 nm
D) 398 nm
E) 796 nm