Low frequencies correspond to deep sounds, like a bass drum; high frequencies correspond to sharp sounds, like a whistle.

In the summer of 1876, in a workshop on the outskirts of London, Francis Galton was busy fashioning brass tubing into an ultrasonic whistle. This unique sliding whistle would produce high-pitched ...

Low frequencies correspond to deep sounds, like a bass drum; high frequencies correspond to sharp sounds, like a whistle ... through self-bending ultrasound beams and a concept called nonlinear ...

Different species of animal have different hearing ranges. This explains why a dog can hear the ultrasound produced by a dog whistle but humans cannot. In both of these applications, the ...

Different species of animal have different hearing ranges. This explains why a dog can hear the ultrasound produced by a dog whistle, but humans cannot. In the first two of these applications ...