Discussion
Put these regions in order of increasing photon energy.
1. Ultraviolet 2. Radio frequency 3. Infrared 4. Visible
Answer: A
Correct answer: 2, 3, 4, 1
Photon energy rises with frequency, so the order follows the spectrum: radiofrequency is the least energetic, then infrared, then visible, then ultraviolet. The same order gives what each region can do - flip a nuclear spin, excite a vibration, and promote an electron, the last requiring the most energy of the four.
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