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Keywords, phrases and learning objectives for sound waves. Know that sound waves can be reflected, refracted and diffracted and the behaviour of sound waves can be explained using a longitudinal sound wave model.
The PDF version of the Teacher Toolkit on the topic of The Nature of Sound is displayed below. The Physics Classroom grants teachers and other users the right to print this PDF document and to download this PDF document for private use.
Refraction of Sound Waves. Refraction of waves involves a change in the direction of waves as they pass from one medium to another. Refraction, or bending of the path of the waves, is accompanied by a change in speed and wavelength of the waves.
Sound is an example of a longitudinal wave, and they can be demonstrated by pushing a slinky horizontally. polarised wave oscillates in only one plane (e.g only up and down), only transverse waves can be polarised.
Figure 1 - Illustration of sound pressure wave compression and refraction In essence, higher frequency sounds, such as bird song or whistles, have a shorter wavelength, whilst deep sounds, such as drums or truck engines, have longer wavelengths. This is illustrated below, along with a representation of louder and quieter sounds.
This simulation lets you see sound waves. Adjust the frequency or volume and you can see and hear how the wave changes. Move the listener around and hear what she hears.
This change in velocity can also result in a change of direction of the sound wave - also known as refraction. For example, refraction occurs when sound travels from warm air into cold air....
