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InterviewSolution
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Given below are some examples of wave motion. State in each case, if the wave motion is transverse, longitudinal or a combination of both?(a) Motion of a kink in long coil spring produced by displacing one end of the spring sideways.(b) Wave produced in a cylinder containing a liquid by moving its piston back and forth.(c) Waves produced by a motor boat sailing in water.(d) Light waves travelling from the sun to the earth.(e) Ultrasonic waves in air produced by vibrating quartz crystal. |
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Answer» (a) The wave motion is transverse, because the vibrations of particle (kink) of the spring are at right angles to the direction of the propagation of wave. (b) The wave motion is longitudinal, because the molecules of the liquid vibrate to and fro about their mean positions along the direction of propagation of the wave. (c) The given motion is a combination of longitudinal and transverse waves. (d) The wave motion is transverse, because the light waves are electromagnetic waves in which electric and magnetic fields vibrate in the direction at right angle to each other and also to the direction of propagation of the wave. (e) Ultrasonic waves produced by a quartz crystal in air are longitudinal because the molecules of air vibrate to and fro about their mean positions along the direction of propagation of wave due to the vibration of quartz crystal. |
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