On Mar 26, 11:49*am, Cecil Moore wrote:
Keith Dysart wrote:
What element provides the energy for this "interference
energy" flow? Note that in this analysis, this energy
is an average energy flow, so it can not be saved during
part of the cycle and returned during another part.

Already answered a few postings ago. Sorry you
missed it. Here it is again:

Since there was no destructive interference in the example,
the rest of your post is snipped as being a non-sequitor.

...Keith