Discussion
What is the usual range of a mid-infrared spectrum?
Answer: C
The mid infrared runs from 4000 down to about 400 reciprocal centimetres, corresponding to 2.5 to 25 micrometres. The ultraviolet and visible range is quoted in nanometres and covers quite different transitions. That the axis conventionally runs from high wavenumber on the left to low on the right, the reverse of a wavelength plot, is a convention worth noting before two spectra are compared. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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