![]() ![]() For instance, the TWEETER of a loudspeaker is shaped in the form of a fan for this purpose. By SAKSHI KM Diffraction of sound wave take place in various different sound items like loudspeakers and woofers. Īs a result of their capability of diffraction, low frequency sounds are difficult to localize or contain in an environment (see CANYON EFFECT, DIFFUSE SOUND FIELD ).Īn acoustic radiator must be specially designed for good dispersion of high frequencies since this does not occur naturally through diffraction. Ĭompare: CANCELLATION, INTERFERENCE, PARABOLIC REFLECTOR, REFLECTION, REFRACTION. Thus, diffraction may aid sound dispersion and DIFFUSION. When the wavelength is similar to the dimensions of the object, as with low frequencies and buildings, or mid-range frequencies and the head, the wave diffracts around the object, using its edges as a focal point from which to generate a new wavefront of the same frequency but reduced intensity. Low frequency sounds have wavelengths that are much longer than most objects and barriers, and therefore such waves pass around them undisturbed. Label each part with one of the following vocabulary words: reflection, Diffraction, refraction, and Wave Interference (Constructive. Such is the case with high frequencies with respect to the head, and thus is important in BINAURAL HEARING. ![]() Some of the energy will reflect, but at the end of the barrier (near the opening of the harbour) the waves will bend around and come inside. If you live near the sea, have a look at waves on a windy day hitting a harbour wall. High frequency sounds, with short wavelengths, do not diffract around most obstacles, but are absorbed or reflected instead, creating a SOUND SHADOW behind the object. A really good example of diffraction can be seen with another type of wave barrier a harbour or dock wall. 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.
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