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Talks about the use of ultrasound, sound at frequencies above audible.
A few pages that have interactive elements to demonstrate what sound is.
A good explanation of how sound waves can interfere and affect what you hear. Includes details of a demonstration with a tuning fork.
An explanation of sound and how it relates to space.
When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - a phenomenon which is ...
A simple explanation of why sound travels long distances at night. There are some attractive graphics.
Hear the sound of the Big Bang as recreated by John Cramer (link to the audio file at the bottom of the page)
The reverberant sound in an auditorium dies away with time as the sound energy is absorbed by multiple interactions with the surfaces of the room.
The first analytical determination of the speed of sound was given by Isaac Newton in Proposition 49 of Book II of the Principia.
A short section on the intensity of sound with links through to details on decibels and other related areas.
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