Diffraction of sound examples3/31/2024 ![]() ![]() Diffraction determines the direction in which most sound will be radiated, an important factor for the acoustical engineers who work to make them as quiet as possible. The white region is a cross-section of the front part of an aircraft engine, the sound wave is produced by the turbofan. The animation below shows another example of diffraction. Diffraction of sound waves is commonly observed we notice sound diffracting around corners or through door openings, allowing us to hear others who are speaking to us from adjacent rooms. Experiment with diffraction through elliptical, rectangular, or irregular apertures. Put up a barrier to explore single-slit diffraction and double-slit interference. Without diffraction, the sound from the stereo could only be heard directly in front of the door. All waves exhibit diffraction, not just sound waves. This bending of a wave is called diffraction. ![]() Thus, this solution for noise reduction is efficient only if the houses are located within the shadow region of the sound barrier. Make waves with a dripping faucet, audio speaker, or laser Add a second source to create an interference pattern. For example, if a stereo is playing in a room with the door open, the sound produced by the stereo will bend around the walls surrounding the opening. It is characterised by low noise levels due only to the acoustic diffracted wave. A shadow region is observed just behind the barrier (bottom right of the animation). Interference patterns due to the superposition of the incident wave and the diffracted wave are clearly seen just before the barrier (bottom left of the animation). The animation below illustrates how a travelling wave emitted from the upper left corner by, say, an aeroplane is diffracted by a sound barrier erected to shield homes from the traffic noise. An example of diffraction phenomena is given by the spreading of waves around an obstacle. The phenomenon in SOUND PROPAGATION whereby a SOUND WAVE moves around an object whose dimensions are smaller than or about equal to the WAVELENGTH of the sound. Diffraction occurs if a wave encounters an object and if the wavelength is of the same size (or greater than) the object size. The spreading of waves when they pass through an opening, or around an obstacle into regions where we would not expect them, is called diffraction.
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