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Himanshu posted an Question
April 12, 2020 • 21:16 pm 30 points
  • IIT JAM
  • Physics (PH)

Degree of freedom

here it is taking DOF as 3 for rotational, vibrational and transitional but for triatomic it is 3 DOF of transitional, 2 for rotational and 5 for vibrational then what is the catch there because it affects the answer

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    Abhishek singh best-answer

    vibrational degree of freedom have double the contribution than rotational and translational. This is some higher level concept. For time being just remember this. it has the concept of number or squared terms in expression of Hamiltonian and it contains both K.E. and Potential energy terms. That's why contribution gets doubled. if you find above discussion heavy going, ignore it. just remember this as a fact.

  • Himanshu Pandey

    in vibrational DOF it is not multiplying by 1/2 and wrote simply 3. wherather it should be multiple of 1/2KT. explain this one also

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    Abhishek singh best-answer

    We have two types of triatomic particals. 1) linear(all three atoms in a line) and another is.... 2) non-linear(also known as 3-D, here all the three atoms are not in a line). In case 1) we have two rotational degree of freedom. But in the later case, we have three rotational degree of freedom. To understand in a better way I am attaching a supporting pic. Best regards.

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    ok and in vibrational DOF it is not multiplying by 1/2 and wrote simply 3. wherather it should be multiple of 1/2KT

    eduncle-logo-app

    and supporting attachment??????

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