I'm trying to plot a graph using mathematica.

I would like to make a plot of the first few energy levels for the 1d particle in a box. so what I am basically trying to do is define a function of x, that depends on a parameter n, and I would like to plot that function with a few different parameters.

Question

I'm trying to plot a graph using mathematica. 

I would like to make a plot of the first few energy levels for the 1d particle in a box. so what I am basically trying to do is define a function of x, that depends on a parameter n, and I would like to plot that function with a few different parameters.

richyw · Answer

$$\psi (x)=\sqrt{\frac{2}{L}}\sin\left(\frac{n\pi x}{L}\right)$$where n=1,2,3...

richyw · Answer

So I want a plot from 0 to L, (the function is 0 elsewhere) that shows $\psi(x)$ for like n=1, n=2 and n=3