Any sound above 20 000 Hz is called ultrasound. It is too high pitched for humans to hear, but other animals (such as dogs, cats, dolphins and bats) can hear ultrasound. Ultrasound waves are ...

Imagine a world where sound becomes visible. In a room full of conversation, we would see soundwaves flowing from person to ...

So sound waves move slower through it, which amplifies the lower frequencies in your voice. But here's the fascinating thing. The pitch of your voice hasn't changed when you inhale either gas ...

This experiment demonstrates how water affects sound waves and pitch. You'll discover how different water levels create different musical notes and learn about the relationship between mass, vibration ...

The scientists then used a microphone to analyse how the sound waves propagated along the grating. The characteristic Rayleigh–Bloch behaviour was observed below a certain pitch: Directly around ...

The “Helmholtz resonator” concept explains the frequencies of sound produced by clapping the hands together in different configurations.