VIT - VITEEE 2025
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Propagation of sound wave is considered one of the most asked concept.
16 Questions around this concept.
The equation of a stationary wave is-
where x is in is in second. The separation between consecutive nodes will be :
The intensity of sound at a point due to a point source is 0.2 w/. If the distance of the source is doubled and the power is also doubled, then the intensity at the point will be
If the bulk modulus of water is , what is the speed of sound in water?
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A whistle whose air column is open at both ends has a fundamental frequency of 5100Hz. If the speed of sound in air is 340m/s, the length of the whistle in cm is:
Propagation of sound waves
Sound is a longitudinal wave that is created by a vibrating source such as a guitar string, the human vocal cords, or the diaphragm of a loudspeaker. As a sound wave is a mechanical wave, so, sound needs a medium having properties of inertia and elasticity. To understand the propagation of sound waves. let us take an example -
Consider a tuning fork producing sound waves. When prong B moves outward towards the right it compresses the air in front of it and due to compression, the pressure in this region rises slightly. The region where pressure is increased is called a compression pulse and it travels away from the prong with the speed of sound.
Now, after producing the compression pulse, prong B reverses its motion and moves inward. This process drags away some air from the region in front of it, which causes the pressure to dip slightly below the normal pressure. This region is decreased pressure region which is called a rarefaction pulse. Following immediately behind the compression pulse, the rarefaction pulse also travels away from the prong with the speed of sound. If the prongs vibrate in SHM then the pressure variation in the layer close to the prong also varies simple harmonically and shows SHM and hence increase in pressure above normal value can be written as -
Here,
Now, the equation can also be written as -
where,
If the change in pressure is not very small then we can write the variation of pressure in the form of -
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