Answer :
The answer is radio wave, waves on the electromagnetic spectrum don't need a medium
For three of the four, you have named the medium ... rope, slinky, and
tuning fork. In each case, there would be no wave without it.
The radio wave, as well as all other electromagnetic waves, can travel
through material media, but don't need one in order to propagate.
tuning fork. In each case, there would be no wave without it.
The radio wave, as well as all other electromagnetic waves, can travel
through material media, but don't need one in order to propagate.