Imagine navigating a pitch-black room and knowing exactly where every object is without ever switching on a light.

a high frequency sound wave has a high pitch; large amplitude sound waves are loud; reflected sound is called an echo; the range of human hearing is 20 Hz to 20 000 Hz; ...

Identify the features of a sound wave and learn about pitch, frequency, amplitude and loudness in this guide for KS3 Physics students aged 11-14 from BBC Bitesize.

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 ...

Sound waves are longitudinal waves. Fast - about 330 meters per second (1083 feet per second) for sound in air, 1,500 m/s (4921 f/s) in water and 5,000 m/s (16,404 f/s) in steel. Sound requires a ...

This invention generates high-frequency sounds in the high-pitched range of human hearing, composed of sound waves between 15,000 and 20,000 cycles per second, which can annoy younger people but ...