What Is the Wavelength of Light That Is Emitted When $\times$

Multiple Choice

What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n = 5 to n = 1?

A) 1.05 $\times$ 10⁷ m
B) 9.50 $\times$ 10^-8 m
C) 2.09 $\times$ 10^-18 m
D) 9.12 $\times$ 10^-8 m
E) none of these