Question

Which of the following is the wave number of near infrared spectrometer?

(a) 4000 – 200 cm^-1

(b) 200 – 10 cm^-1

(c) 12500 – 4000 cm^-1

(d) 50 – 1000 cm^-1

I have been asked this question in class test.

The query is from Instrumentation of IR in division Colorimetry and Spectrometry of Analytical Instrumentation

Answer 1

The correct answer is (c) 12500 – 4000 cm^-1

To elaborate: The wave number of near infrared spectrometer ranges between 12500 – 4000. Wavenumber is the reciprocal of wavelength.