The speed of sound depends on the type of medium that the wave is traveling through. In air, the speed of sound is about 340 m/s or 760 mph for a normal spring day. The speed also depends on the temperature of the medium.

The formula used to figure out the speed of sound, in air, on any given day is;

v = 331 m/s + 0.6T

where v is the velocity of the wave, T is the temperature of the air in degrees celcius, 331 m/s is the speed of sound at 0°C, and 0.6 is just a constant. So as the temperature increases, so does the speed of sound at a rate of 0.6 m/s for each celcius degree.

The following table represents the speed of sound in various media. It was taken from Gundersen's

The Handy Physics Answer Book

Medium

Speed of sound (m/s)

Air (0°)

331

Air (20°)

343

Air (100°)

366

Helium (0°)

965

Mercury

1452

Water (20°)

1482

Lead

1960

Wood (Oak)

3850

Iron

5000

Copper

5010

Glass

5640

Steel

5960

The speed of sound also depends on the compressiblility and inertia of a material.

This can be represented as : v^{2}= (elastic property / inertial property). Where the elastic property is usually the bulk modulus or Young's modulus of the medium, and the inertial property is the density of the medium.

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