93. Which one can cause rotational changes in a
molecule?
A. Ultra violet B. Micro wave
C. Infra-red D. Radio wave
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Absorbed microwave radiation can cause changes in rotational energy levels within molecules, making it useful for other purposes. The rotational energy levels within a molecule correspond to the different possible ways in which a portion of a molecule can revolve around the chemical bond that binds it to the remainder of the molecule. Because the permitted rotational levels depend on the natures of the bonded atoms (e.g., their masses), microwave radiation can be used for qualitative analysis of some organic molecules.
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