Thursday, November 13, 2008

Sonoluminescence, Quasars, and the Prandtl-Glauert Singularity

just because i was thinking about sound, light, sonoluminescence, quasars, throat singing, and the Prandtl-Glauert Singularity :

Sound and Light
"snaps a specialized claw to create a cavitation wave that generates pressure levels of 218dB, the pressure wave is strong enough to kill small fish, and can also produce Sonoluminescence (the emission of short bursts of light from imploding bubbles in a liquid when excited by sound....)" ... from Wikipedia

Deadly pistol shrimp that stuns prey with sound as loud as Concorde found in UK waters .... from Mail Online

Light :
"The brightest object yet observed in the universe has been discovered by a University of Washington astronomer and his colleagues.
The quasar (or quasi-stellar object) is 4 million-billion to 5 million-billion times brighter than the Sun. It is estimated to be more than 10 times brighter than any other quasar, and outshines the brightest galaxy by more than 100 times." ... from EurekAlert!

"It took Dalhousie University professor Jason Brown six months and some advanced mathematical analytical techniques to crack the code behind one of the most mysterious sounds in music: the "prraaaaaangg" sound at the beginning of the Beatles' "Hard Day's Night." Guitarists have puzzled over how this chord is played for decades because it contains a note that would be impossible for the Beatles' two guitarists and bassist to play in one take, and experts have concluded that no multitracking was involved in this part of the song. The secret sauce, as it turns out, includes five piano notes apparently played by producer George Martin. Brown made the discovery by disassembling the sampled amplitudes into the original frequencies using Fourier transforms." ... from wired

Sound :

...interesting condensation clouds that form around jets as they fly at or near the speed of sound, (often called "going through the sound barrier" or "accelerating past the speed of sound"). Under the right conditions, and even at lower speeds, they sometimes cause a vapor cone effect. Understand that these Prandtl-Glauert condensation clouds can also occur at lower speeds, and are not really a visible manifestation of some kind of a sound barrier being broken... from Wilk4

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