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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
Question
Given below are some example of wave motion. State in case, if the wave motion is transverse, longitudinal or a combination of both? Ultrasonic waves in air produced by a vibrating quartz crystal.
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Answer

Longitudinal, because the direction of vibration of air molecules is to and fro about its mean position along the direction of propagation of wave due to the vibration of quartz crystal.

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