Discussion
The region below about 1500 reciprocal centimetres, complex but highly specific, is the ______ region.
Answer: B
This is the fingerprint region, used to confirm identity by comparison with a reference rather than to assign bands individually. The group frequency region lies above it, overtones appear at roughly twice a fundamental's wavenumber, and the far infrared is below 400. A region whose very complexity makes it useless for assignment and ideal for identification is worth understanding as a deliberate division of labour. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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