josephruth on August 27, 2010, 01:42:03 am
sound waves work by disturbing matter beside them like dominoes falling, one hits the next and so on. This is why it doesn't work in a vacuum , there is nothing to bump into. electromagnetic waves (light) work differently. the actual photon(particle of light or energy) move in a wave at the speed of light until it hits something. distance is not an issue for light waves because according to the theory of relativity particles travelling at the speed of light, time and distance shrink to zero. So for the light wave it doesn't notice time and distance but for us not moving fast we see it as taking time to get somewhere and travailing far. light waves travel in a vacuum very far before it hits anything so communicating with a satellite is no problem.

« Last Edit: August 29, 2010, 11:51:23 pm by josephruth »