Why for linear molecule moment of inertia due to rotation about bond axis is zero?
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As the moment arm becomes zero when the moment of inertia due to rotation is considered along the bond axis, the total moment of inertia also becomes zero
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that for linear molecules, the moment of inertia around the molecular axis is zero, as all the atoms lie on the axis ofrotation so are at zero distance from it. The amplitude of a vibration is small compared to the bond length of therotating molecule, therefore bond length can be regarded as constant i.e.
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