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Re: Wave Question



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