If the sound arrives at a given location such that compressions meet rarefactions, then destructive interference will occur resulting in a reduction in the loudness of the sound at that location.
A common physics demonstration involves producing beats using two tuning forks with very similar frequencies.

checkbox. If you have a stereo sound card, then check the Stereo The speakers are shown as blue dots.

Huge thanks to Bob Hanson and his team for converting this applet to javascript. It should be said again: two sound waves that have a clear whole number ratio between their frequencies interfere to produce a wave with a regular and repeating pattern; the result is music. Amazingly, in a situation such as this, two sound waves would combine to produce no sound. But how can sound waves that do not possess upward and downward displacements interfere constructively and destructively? 2. although there may be many differences because of reflections off To demonstrate this nature of music, let's consider one of the simplest mixtures of two different sound waves - two sound waves with a 2:1 frequency ratio. One might say that two sound waves that have a clear whole number ratio between their frequencies interfere to produce a wave with a regular and repeating pattern.

Note that the red wave has three-halves the frequency of the blue wave.

This is a form of constructive interference. By default, the speakers are 180 degrees

As a compression passes through a section of a medium, it tends to pull particles together into a small region of space, thus creating a high-pressure region. The message is clear: if two sound waves that have no simple mathematical relationship between their frequencies interfere to produce a wave, the result will be an irregular and non-repeating pattern. A simple sinusoidal plot of the wave pattern for two such waves is shown below. stereo is working. Observe (look carefully) that the pattern of the resultant is neither periodic nor repeating (at least not in the short sample of time that is shown).
When two sound waves with similar but not identical frequencies, f1and f2, interfere with each other, the result is a sound wave with an apparent frequency equal to the average of the two frequencies: f= ½(f1+ f2). If we place them side-by-side, point them in the same direction and play the same frequency, we have just the situation described above to produce constructive interference: A piano tuner frequently utilizes the phenomenon of beats to tune a piano string. In the music world, such waves are said to be a fifth apart and represent a popular musical interval. Such earphones capture sound from the environment and use computer technology to produce a second sound wave that one-half cycle out of phase.

The beat frequency refers to the rate at which the volume is heard to be oscillating from high to low volume. At each of the noted points in the previous diagram, the interference is Important Note: Many of the diagrams on this page represent a sound wave by a sine wave. Finally, the diagram below illustrates the wave pattern produced by two dissonant or displeasing sounds.

A snapshot in time of the appearance of these waves is shown in the diagram below.

This combination of waves is known as an octave.

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