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← ScienceWhich outcome follows when a molecular vibration matches infrared radiation frequency?
A)Selective absorption of the radiation✓
B)Molecular phosphorescence becomes more intense
C)Bond dissociation enthalpy decreases
D)Radiative emission increases noticeably
💡 Explanation
When the frequency of infrared radiation matches a molecular vibration, resonant absorption occurs, because energy is transferred into the molecule's vibrational mode through vibrational excitation. Therefore, absorption increases selectively at specific frequencies, rather than causing phosphorescence or emission.
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