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How is the wave number of electromagnetic radiation related to wavelength?

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How is the wave number of electromagnetic radiation related to wavelength?

(a) It is the reciprocal of wavelength

(b) It is directly proportional to wavelength

(c) It is not related to wavelength

(d) It is equal to wavelength

This question was posed to me in an interview.

This interesting question is from Spectral Method of Analysis topic in chapter Colorimetry and Spectrometry of Analytical Instrumentation

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Right answer is (a) It is the reciprocal of wavelength

Explanation: Wave number is the number of waves spread in a length of one centimeter. It is the reciprocal of wavelength.

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