Radio Astronomers Often Study the Radiation Emitted by a Hydrogen

Multiple Choice

Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state.This radiation has a wavelength of 21 cm.What is the energy difference between the hyperfine levels?

A) 5.92 × 10^-6 eV
B) 5.92 × 10^-25 J
C) 1.66 × 10^-24 J
D) 4.73 × 10^-25 J