# Finding the curvature of a point on a wave,help pls,thx

1. May 21, 2010

### pliu123123

May i know how to find the curvature of a point on a wave function?

e.g
wave function: y=Asin(wx)

and i want to find the curvature of a point at for example x=x0 and y= Asin (wx0)

thank you very much

2. May 22, 2010

### HallsofIvy

If y= f(x), the curvature at $x= x_0$ is given by
$$\frac{|f''(x_0)|}{(1+ f'^2(x_0))^{3/2}}$$.

3. May 23, 2010

### pliu123123

o thx HallsofIvy~~