Echo is caused by the:

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

The unit used to measure the loudness of sound is:

The speed of sound is greatest in:

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

Sound waves are an example of:

Waves that require a medium to travel are called:

The number of complete waves passing a point per second is called:

In a transverse wave, particle motion is:

The distance between two consecutive crests of a wave is called:

The phenomenon of bending of light around obstacles is called: