THE recent discovery of solar radio noise, in the range 30-1,000 megacycles ... will produce electromagnetic radiations the maximum wave-lengths of which are comparable to stellar dimensions.

trumpet the sound from the trumpet comes from a vibrating column of air created by buzzing lips of the trumpeter A sound wave is a longitudinal wave. When an object vibrates it produces a ...

NASA created a haunting audio clip of sound waves rippling out of a supermassive black hole, located 250 million light-years away.

The difference is in how the carrier wave is modulated, or altered. With AM radio, the amplitude, or overall strength, of the signal is varied to incorporate the sound information. With FM ...

By containing the sound wave on the surface of a chip ... defense systems and even radio astronomy. More information: Govert ...