The longest wavelength of a photon that can be emitted by a hydrogen atom,for which the initial state is n = 3,is closest to:
A)550 nm
B)575 nm
C)600 nm
D)625 nm
E)650 nm

Question

Quizplus · Accepted Answer

The longest wavelength corresponds to the smallest energy transition. For n = 3, the smallest transition is from n = 3 to n = 2. Using the Rydberg formula, the wavelength is calculated to be approximately 656 nm, which is closest to 650 nm.

The Longest Wavelength of a Photon That Can Be Emitted