The properties of the medium through which it's traveling.An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound So remember, the speed of a sound wave is determined entirely by In other words, yelling won't causeĪnyone to hear you faster, they'll just hear a louder sound when the sound waveĪrrives at their location. With a large amplitude, it won't travel anyįaster than a sound pulse with a small amplitude in the same medium. People often think thatĬhanging the amplitude will change the speed of a All of these changes to the medium would affect the speed of sound. Or the density of the air, or you can swap out the airĮntirely for another material, like water or helium or a metal. The temperature of the air or the humidity of the air So, to change the speed of sound in air, you can change things like The properties of the medium that the sound wave is traveling in. So, how can we change the speed of sound? Well, the only way toĬhange the speed of sound is to change the medium or You can do to the speaker that would increase the speed of sound. If you increase the frequency, the wavelength will decreaseīy that same factor, and the speed of the sound The speed of the sound wave, but that's not what happens. When looking at this equation, you might think that if you adjust the setting on your speakerĪnd increase the frequency you'd also be increasing This formula is accurateįor all kinds of waves, not just sound waves, because a wave has to move one To be one over the period, we can rewrite this formula as speed equals wavelength times frequency. Since the wave is traveling forwards one wavelength per period, or since the frequency is defined To be the distance per time, the speed of a sound wave has to be the wavelength of the wave divided by the period of the wave. To be back where it started after one period. This is because the wave has to overlap with its initial shape after one period, because the molecule has Shape has moved forward one complete wavelength. It takes one period for this molecule to move back and forth The velocity of a sound wave, let's look closely at So, the speed of a sound wave can be found by finding the speed of the peaks or the speed of the valleys or the speed of any single Of the air displacement versus position of the air, we can see that as the wave travels the shape of this wave On the surface of water are examples of transverse waves. When the wave velocity points perpendicular to the We call sound a longitudinal wave because the wave is traveling parallel to the line traced out by the Moving with the speed, but by the speed of sound, we mean the speed of the disturbance as it moves through the air molecules. Note that the speed of sound does not mean the speed of the air moleculesĪs they move back and forth. The speed of the waveĬan again be determined by the speed of the compressed regions as they travel through the medium. We can also watch the speed of sound of a repeating simple harmonic wave. In non-humid air at 20 degrees Celsius, the speed of sound is about 343 meters per second Of this compressed region as it travels through the medium. We can find the speed of sound by looking at the speed Make one short burst, we'll create a pulse wave.
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