Tuning fork producing sound waves in air.ī 2, the pressure of air in the adjoining layer decreases. When the prong moves backward from B 1 toįig. As this compressed layer moves forward, it compresses the next layer and so on. As this prong moves from B to B 1 it compresses the layer of air in front of it. Its both prongs first move inward and then outwards and so on. Consider a vibrating tuning fork producing sound waves as shown in Fig. Sound travels through air in the form of longitudinal waves. When air is removed, sound from the bell cannot travel to the wall of the jar. This makes the wall to vibrate which in turn, sends sound to us. ![]() When there is air inside the jar, sound travels through it to the wall of the jar. When most of the air has been removed, we hear a very feeble sound. Now, we pump out the air from the jar gradually with the help of the vacuum pump. When we turn on the switch, we hear the sound of the bell. ![]() ![]() Experiment showing sound needs a medium to travel. Place the jar over a disc which has a pipe connected to a vacuum pump, as shown in Fig. Suspend an electric bell inside a glass bell jar by passing the connecting wires through an airtight cork fitted at the mouth of the jar. This can be demonstrated by the following simple experiment.Įxperiment. It can travel through air, water, steel, etc. Sound is a mechanical wave which needs a material medium to travel.
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