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## Main Question or Discussion Point

What does one mean by normal mode of an object? Why is it 3n-5 for linear particles, 3n-6 for non linear particle where n is the number of particle.

- Thread starter ajayguhan
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- #1

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What does one mean by normal mode of an object? Why is it 3n-5 for linear particles, 3n-6 for non linear particle where n is the number of particle.

- #2

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The numbers can probably be derived from symmetry arguments, I don't know how, but it's easier just to draw out molecules for n = 2 and 3 and try to convince yourself that there is an agreement with the formulas.

- #3

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Is there any book which explained it in more detailed manner! That you could recommend?

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Thanks

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