Quote Originally Posted by blackmage_nuke View Post
It can also be used to represent the swing of a pendulum with the amplitude being the maximum distance from the normal and the frequency being the actual frequency of the swing. I think it can be used to show the velocity too but i forget how.
Take a derivative. It's something like -4cos(4pi) with a bunch of coefficients everywhere, based on a particular pendulum.

Quote Originally Posted by Goldenboko View Post
Ah I see. Would the period of a radio wave always be the same since no modulation notes a change in the period, only in the frequency?
If you change the period, the frequency must also be changed. If one is given as b, and one is given as 1/b, there can't be any way for you to change b and not have those values both be different from their previous iteration.