A) 2
B) 4
C) 6
D) None of these
Correct Answer: D
Solution :
Key Idea: A diatomic molecule can rotate about any of three co-ordinate axes. |
The molecule of a triatomic gas has a tendency of rotating about any of three co-ordinate axes. So it has 6 degrees of freedom, 3 translational and 3 rotational. At high enough temperature a triatomic molecule has 2 vibrational degrees of freedom. |
But as temperature requirement is not given, so we answer simply by assuming triatomic gas molecule at room temperature. |
Thus, \[f=6\] |
(3 translational + 3 rotational) at room temperature. |
Alternative: |
For non linear triatomic gas, \[N=3\] and restrictions k are also 3. |
\[\therefore \] \[f=3N-k\] |
\[=3\times 3-3=6\] |
For linear triatomic gas \[k=2\] |
\[\therefore \] \[f=3\times 3-2=7\] |
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