02. Observable Universe and Beyond
(Source: infinity-imagined)
Physics That Resonates With Everyone
Chladni patterns mix sound with science
In the late 18th century, musician and scientist Ernst Chladni demonstrated the two-dimensional vibration of a flat plane caused by certain sound waves. Following in the footsteps of Robert Hooke, Chladni drew a rosined bow across the edge of a sand-covered metal plate. When the bow created certain frequencies of vibration, the beautiful patterns above were formed.
When sound travels through a solid medium like a metal plate, certain frequencies will produce resonance. Resonance is the property of a given material to vibrate easily and vigorously at specific frequencies, and the patterns created in Chladni’s experiments represent the nodes between intersecting two-dimensional waves. Every solid material from wood to glass to metal to buildings to our inner ear membranes have a set of frequencies that will cause these resonant vibrations.
Today we use these kind of vibrations to perfect the acoustics of instruments like guitars and violins, and we even see their relatives in the standing waves that underly electron orbitals.
Check out this video for more. Got a violin bow? Try it yourself!
(via project-argus)
Astronomers at the European Southern Observatory have discovered a planet approximately the same size as Earth orbiting Alpha Centauri B, one of the closest stars to our own.
The Alpha Centauri system is only 4.3 light years away, and it is the most logical destination for the first interstellar spacecraft. Until now no planets had been detected in this system, which has two co-orbiting stars. The newly discovered planet orbits Alpha Centauri B, which is 90% as massive and 50% as luminous as our Sun. The planet completes an orbit every 3.2 days at a distance of 0.04 AU, far to close to support liquid water. However this discovery indicates that Earth-mass planets are within our ability to detect in nearby star systems. The planet was detected using the HARPS instrument on the 3.6-metre telescope at ESO’s La Silla Observatory in Chile. The results will appear online in the journal Nature on 17 October 2012.