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How many degrees of freedom does a chemical compound of N atoms have?

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How many degrees of freedom does a chemical compound of N atoms have?

(a) 2N

(b) 2N + 1

(c) 3N

(d) 3N + 1

This question was addressed to me in an interview for job.

I would like to ask this question from Raman Effect topic in section Quantum Physics of Engineering Physics I

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The correct option is (c) 3N

Explanation: For any given chemical compound, there are a total of 3N degrees of freedom, where N is the number of atoms in the compound.

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