Let us define diffraction first. As we know diffraction is the bending of the waves when they collide with an obstacle. It is also possible when the waves pass through the slit etc. Now the point to think here is something our discussion will be about. Imagine there is a wall between you and your friend. The wall has a little hole on the top. Your friend calls you from the other side. You will be able to hear his voice that is for sure. How do you think this is possible? This is because of the bending of the sound waves and their spherical passage through the hole in the wall. So, waves that we referred to in the above definition will include both sound and light waves.
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Diffraction sound is an interesting phenomenon in itself. Imagine a sound proof room. It is sound-proof; this means that it does not have any small or big openings which would have otherwise led to this phenomenon.
While discussing sound diffraction we should also take in account the wavelength of the sound wave. When the order of wavelength of the obstacle or its size is the order of the wavelength of the sound waves which pass through it then we will be able to experience the phenomena. This is because in other cases the effect will be negligible.
As already mentioned the diffraction of a wave may include both light waves as well as sound waves. In fact the sensation of vision is mostly possible because of this phenomenon. Sound waves also have the ability of reflection. This combined gives rise to many interesting phenomena.
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Let us also discuss a few examples of this.
When sitting in a auditorium; even when it is curved or spherical we are able to hear the sound due to its bending at collision with various objects. Also consider a big building and someone playing music at one end and people standing at other side of the building. Sound obviously exhibits the phenomenon of diffraction in this case. Drums playing in a marriage and you being able to hear it inside your house are another example of the same combined with reflection of sound waves.
Even take an example of sound barriers build to protect the tenants from traffic noise. But then also people are able to hear the noise in a lower amount. This is also because of the same phenomenon.