Solve problems in physics about waves?

Answer 1

It depends on what you mean by waves. However, the basic equation used in waves is:

wavelength = velocity/frequency

or in actual writing:

λ = v/f

The velocity, also known as speed, is pretty self explanatory. It is no different from "the measurement of a travelling object", except this is the measurement of a wave through its medium (if it has one).

The frequency is the number of waves that occur or that pass a specified point, per unit time, usually recorded as a hertz or cycles per second.

Easy? :D

-A.L