Parabolic microphones offer a fascinating blend of geometry and acoustics, enabling long-distance sound capture with surprising clarity. From dish-shaped reflectors to pinpoint audio focus, this quick ...

WASHINGTON D.C., January 5, 2015 -- A team of researchers at the University of São Paulo in Brazil has developed a new levitation device that can hover a tiny object with more control than any ...

So far we have only considered sound in isolation and we have seen that sound has velocity, frequency, wavelength and reduces in intensity in proportion to the square of the distance from the source.