# What are the properties of sound waves?

Oct 14, 2015

sound waves are mechanical waves so they need a medium for propagation.

#### Explanation:

The most fundamental properties of sound waves are:-
1. Wavelength
2. Frequency
3. Amplitude

Most of the other properties like speed,intensity etc. can be calculated from the above three quantities.

Oct 14, 2015

I have listed some below

#### Explanation:

• They are longitudinal in nature - that means the disturbances are parallel to the direction of motion of the wave.
• The cannot travel through a vacuum. They need a medium to travel through.
• They travel fastest through solids and slowest through gases.
• They obey the wave equation $v = f \lambda$ and their speed through air at sea level is approximately $340 m / s$
• They can be reflected and obey the law of reflection.
• They can be refracted, diffracted, undergo superposition (interference), etc.
• Their frequencies may appear different to observers in relative motion due to the Doppler Effect.