Discussion
A band at \( 4000 \ \mathrm{cm^{-1}} \) lies at a wavelength of
Answer: A
Inverting the same relation:
\[ \lambda = \frac{10^{7}}{4000} = 2500 \ \mathrm{nm} \]
giving 2500 nanometres, in the near infrared. Because the two scales are reciprocal, a band that looks narrow on one looks wide on the other, which is worth bearing in mind when comparing spectra plotted in different units.
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