Talk:Modern Physics/The Doppler Effect

The Doppler effect for sound is depending on the relative speeds of source and observer to the air(propagating media). The Doppler effect for light or electromagnetic waves depends only to the relative radial speed of the source and observer. In these cases, source and observer have symmetrical role. Tor these reason, relative Doppler effect presented on the module is only valid for electromagnetic fields. --LALANNE 08:27, 2 April 2006 (UTC)