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E-STAR - Student

Home Physics PHYSICS: A Textbook for Grade 11   Chapter 5: Waves

E-Lecture - Speed of Sound in Air

The speed of sound in air depends on the temperature of the air. When the temperature of a medium increases, the kinetic energy of all the molecules in the medium increases and hence the speed of sound in moving through this medium also increases. For sound traveling through air, the relationship between wave speed and medium temperature is:

where Tc is the temperature in °C and 331.5m/s is the speed of sound at 0°C. This equation is approximated as:

V = (331.5 + 0.6Tc) m/s

From this equation we see that, at a temperature of 0°C, sound waves travel with a speed of 331.5m/s. The speed of sound increases by 0.6 meters per second (m/s) for every degree-Celsius increase in temperature.

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