Art Unwin wrote:
First of all," energy cannot be created or destroyed " which puts"
destructive" as an obsolete word

Many words are used in a non-literal sense. Superposition
resulting in destructive interference doesn't mean that
energy has been literally destroyed, just that it has
been "redistributed to regions that permit constructive
interference" (FSU web page).
--
73, Cecil http://www.w5dxp.com
"According to the general theory of relativity,
space without ether is unthinkable." Albert Einstein