The range of audible frequencies for a normal human ear is approximately:

The unit used to measure the loudness of sound is:

Waves that require a medium to travel are called:

Echo is caused by the:

In a transverse wave, particle motion is:

The relationship between wave speed, frequency, and wavelength is given by:

The phenomenon of bending of light around obstacles is called:

The speed of sound is greatest in:

Resonance occurs when the frequency of an external force matches the:

Sound waves are an example of:

The Doppler effect refers to the change in: