Reflection of sound waves

A bell ringing rapidly, a drum moving up and down to the beat and a reverse rating harp string are all examples of objects that make sounds.
In this article let us learn about the reflection of sound waves.

Learning reflection of sound waves

Have you ever shouted into a well or inside an empty hall or in a cave? One can hear their own voice after a short time. Why is it happenning ? It happens because the sound of your voice is reflected from the walls.
We can also try this by shouting  into a well or by the side of a steep hill. This phenomenon of hearing your own sound again is called an echo. The rolling of thunder is largely due to successive reflections from clouds and land surfaces. For the reflection of sound waves, we need an extended surface, or obstacle of large size which need not necessarily smooth or polished.

Learning reflection of sound waves from one medium to other:

Generally, when sound waves in one medium strike a large object of another medium such as air, a wall, etc… , a part of the sound is reflected, and the remainder is sent into the new medium. The speed of the sound in the two mediums and the densities of the medium help to determine the amount of reflection. If the sound travels at about the same speed in both the materials and both have about the same density, little sound will be reflected, instead most of the sound will be transmitted into the new medium. If the speed differs greatly in the two and their densities are greatly different, most of the sound will be reflected.
When you shout at a brick wall most of the sound is reflected, because brick is denser than air.

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