Gene Fuller wrote:

...
Remember, calculate fields first and then worry about power or energy.
Any change in that calculation order will surely lead to "traveling
waves of average power" and other such gems.

I hope no Joules are hurt in the collision.

73,
Gene
W4SZ

If two boards of a length are secured upon the surface of a body of
water, their parallel distances to each other computed to "contain"
"standing waves" of a certain frequency, and a device to "impart energy"
placed against one, to "strike" the surface of the water--much can be
seen without the necessity of "complicating maths."

Or, a substantial mud puddle, two boards and a timing circuit ...

Regards,
JS