Substituting the plane wave solution into the wave equation

[janemba]

what do you have to do to solve this

 

[Hootenanny]

Try substituting the plane wave solution into the wave equation.

 

[janemba]

And what rule do you use to do that

 

[Dick]

You use, like, (d/dx)e^(f(x))=(d/dx)(f(x))*e^(f(x)). The ordinary rules of differentiation. Just tell us what you get. The exponentials should cancel on both sides leaving you with an algebraic relation between omega and k.

 

[janemba]

is there like a video that teach you the rules of ordinary rules of differentiation ?

 

[Dick]

I don't know that there is a video, but try any elementary calculus text. Pay particular attention to the 'chain rule'.