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AP Physics 2/Unit 15 – Modern Physics
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Atomic Absorption Spectra

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When light with a continuous spectrum passes through a cool gas, the resulting spectrum contains dark lines. Which of the following statements best explains this phenomenon?

A

Atoms in the gas absorb photons with specific energies corresponding to their energy level differences

B

Electrons in the gas reflect specific wavelengths back toward the source

C

The gas emits photons that destructively interfere with the continuous spectrum

D

The gas scatters all wavelengths equally, creating uniform dimming

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