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## Main Question or Discussion Point

When two waves that are 180 degrees out of phase interfere, the energy from both cancels out. Why is it that, for example, a sound wave, which is a form of energy, can disappear when combined with another when the Law of Conservation of Energy states that energy cannot be destroyed?

I posed this thought in my Physics class the other day, and the instructor said, "The Law of Conservation of Energy works great when you're working with concrete trucks and things, but when you get into more detailed physics it doesn't really apply." I think this is bogus, since it is a law, which means it is accepted to work all the time with no exceptions. Unfortunately, I don't have a sufficient argument to prove my point.

Any help is greatly appreciated.

Chris

I posed this thought in my Physics class the other day, and the instructor said, "The Law of Conservation of Energy works great when you're working with concrete trucks and things, but when you get into more detailed physics it doesn't really apply." I think this is bogus, since it is a law, which means it is accepted to work all the time with no exceptions. Unfortunately, I don't have a sufficient argument to prove my point.

Any help is greatly appreciated.

Chris