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