Essentially anything that repeats has a frequency associated with it. To calculate frequency we find the reciprocal of period. To find the wavelength of a wave you just have to divide the waves speed by its frequency.
F is the number of waves produced by a source per second it is.
Frequency frac 1 timeperiod ffrac 1 T where. Formula to calculate wave frequency is given by. Divide the velocity by the. The usual period is 2 p but in our case that is sped up made shorter by the 4 in 4x so Period p2.