Re: Wave Question

[Leigh Palmer <palmer@SFU.CA>]

> Calculating from the amplitude is well-established. But I was pondering
> where the "extra" energy came from, and this has also been answered
> qualitatively --- by looking at the whole system, i.e. while the energy has
> doubled at constructive points, the energy is lowered on other points. But
> how do we prove it more convincingly, maybe mathematically?

The elegant way is to use physics, the law of conservation of energy.

Leigh