The wave equation is a very important formula that ... m\,s^{-1}\). The speed of sound in air is \(340 m\,s^{-1}\). The speed of light and sound changes in different materials.

Sound waves can reflect off surfaces ... of sound and the time it takes for the echo to be detected, we can use the equation: Speed = \(\frac{\text{distance}}{\text{time}}\) ...