On Oct 17, 9:28*am, "Szczepan Bialek" wrote:
*"K1TTT" ...

water flow and water waves are NOT good analogs for electromagnetic

waves. *the only common part is that some part of the solution of
their equations includes a sine or cosine function.

Each waves are the same. They transport mass and energy. They never are
harmonic.
S*

no, waves can transport energy without mass. photons have not rest
mass, only energy... look that up in your favorite wikipedia. sound
waves require mass, but don't have to transport it, just move it back
and forth around a point, thus they move energy without net movement
of mass.