Simple Harmonic Motion:

An event is said to be a simple harmonic motion if it can be described by:

y = a sin ( bx - c )

where b > 0 and x is the distance. If so, the amplitude is | a | , the wavelength, denoted by l (the Greek letter lambda), l = 2p/b and the phase shift is c / b.

Frequency = 1/period

Frequency ´ period = speed