at what speed do
electromagnetic waves travel ?
Light is an electromagnetic wave, and its speed
is the speed of all forms of electromagnetic
radiation.
That speed is 186,282 miles (299,792 km) per
second in vacuum, slightly less in any material
medium.
it depends on how the motion got started and
what forces are acting. but for electromagnetic
radiation, it only has one speed - the speed of
light - no matter what frequency or wavelength
or intensity of the radiation.