We learn a lot about our surroundings thanks to sound. But... what is it exactly? In this episode of Crash Course Physics, Shini goes over some of the basics (and some of the not so basics) of the ...

The questions in this quiz are suitable for GCSE physics students who are studying sound waves, ultrasound and seismic waves. If you struggled with the quiz, don't panic - we've got you! You can ...

Ultrasound close ultrasoundSound with a frequency greater than 20,000 Hz (20 kHz). waves have a frequency higher than the upper limit for human hearing – above 20,000 Hertz (Hz). Different species of ...

The term most often used in measuring the magnitude of sound. It is a relative quantity in that it is the ratio between the actual SOUND PRESSURE and a fixed reference pressure. This reference ...

An instrument for measuring the level of sound pressure in DECIBELs. Such measurements are called sound level readings. See: SOUND LEVEL. Sound level meters usually ...

A soap bubble’s swan song is a quiet “pfttt.” Put your ear next to a soap bubble, and you might hear a high-pitched sound as it bursts. Now, scientists have characterized that sound using an array of ...