Energy Levels: 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? (1 eV = 1.60 × 10-19 J)
A. 5.9 × 10-6 eV
B. 5.9 × 10-25 J
C. 1.7 × 10-24 J
D. 4.7 × 10-25 J
Answer: A
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