# Resources for Doppler effect.

I am an undergraduate student and I can barely find a resource that shows the math involved with the doppler effect such as calculus, change in frequency, etc. I already asked so many questions about this topic but your help is very useful.

## 1 Answer

In addition to the suggestions in the comments, I think a good starting point is to study the wave equation (see Wikipedia for example). Look at the simplest case of a one dimensional plane wave travelling in one direction, say positive $$x$$, and then ask yourself what happens when you change from a stationary reference frame to one travelling with constant speed $$v_0$$ in the $$+x$$ and $$-x$$ directions, i.e. $$x'=x \mp v_0 t$$.