A gas of cold atoms strongly absorbs light of a specific
Chapter , Problem 4P(choose chapter or problem)
Problem 4P
A gas of cold atoms strongly absorbs light of a specific wavelength. Warming the gas causes the absorption to decrease. Which of the following is the best explanation for this reduction?
A. Warming the gas changes the atomic energy levels.
B. Warming the gas causes the atoms to move at higher speeds, so the atoms “see” the photons at larger Doppler shifts.
C. Warming the gas causes more collisions between the atoms, which affects the absorption of photons.
D. Warming the gas makes it more opaque to the photons, so fewer enter the gas.
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