The First Bohr Radius, A₀, Is 0

Multiple Choice

The first Bohr radius, a₀, is 0.0529 nm and the corresponding energy, E₀, is 13.6 eV. The wavelength of the light emitted as a hydrogen atom undergoes a transition from state n = 4 to n = 2 is

A) 656 nm.
B) 486 nm.
C) 434 nm.
D) 410 nm.
E) None of these is correct.