Optics Question 304

Question: In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption

[SCRA 1994]

Options:

A) Ultraviolet

B) Microwaves

C) Infrared

D) Radio waves

Show Answer

Answer:

Correct Answer: B

Solution:

Molecular spectra due to vibrational motion lie in the microwave region of EM-spectrum. Due to Kirchhoff’s law in spectroscopy the same will be absorbed.



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