Sound waves in air are (a) Transverse (b) Longitudinal (c) Electromagnetic (d) Polarised

Sound waves in air are (a) Transverse (b) Longitudinal (c) Electromagnetic (d) Polarised
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For the same dimensions of the shaft which of the following has the greater natural frequency? a) Transverse b) Longitudinal c) Depends on thickness d) Depends upon length

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The critical speed of a shaft with a disc supported in between is equal to the natural frequency of the system in a) transverse vibrations b) torsional vibrations c) longitudinal vibrations d) none of the mentioned

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