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Posts Tagged "lasers"

Observations

How Lasers Could Help Build a Better Stereo Speaker [Video]

Are your stereo’s woofers and tweeters not getting along? Physics to the rescue! Researchers at the National Physical Laboratory (NPL) in the U.K. have developed a way to find “dead spots” in front of loudspeakers. Dead spots result from destructive interference from the output of two different speakers, whether from two separate speaker units or [...]

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Observations

Laser-powered device delivers tiny projectiles with pinpoint accuracy

A group of physicists has built what may be the world’s gentlest cannon, a device that pushes tiny particles along using laser light at about a hundredth the walking speed of the average human. The researchers described their experimental setup in a paper published in the September 10 issue of Physical Review Letters. The device [...]

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Observations

Sounds like art fraud: Acoustic waves give clues to paintings’ provenance

painting found to be forgery by analysis of inorganic pigment not used

Theft, imitation and outright deception can make a painting’s history even murkier than centuries of accumulated grime. But getting to the bottom of a piece of art’s origins can be crucial for restoration—and forensics. In recent decades, art scholars, restorers and forensic specialists have relied increasingly on scientific techniques to determine the chemical composition of [...]

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Observations

Optic pacemaker: Embryonic heartbeats paced with laser pulses

heart rate can be controlled with optic laser

The heart’s electrical pulse has made possible the modern-day pacemaker, a device that has helped keep millions of human hearts beating. Such invasive devices, however, have proved difficult to use on small, delicate embryonic animal hearts, which some researchers study to learn more about the early stages of heart development, as well as to develop [...]

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Observations

Watching the electrons, and chemistry in motion

krypton-ionizing-image

The elusive goal of observing chemistry in action at the atomic level just took a quantum leap forward. Physicists using laser pulses have been able to observe for the first time—in real time—the outermost electrons of krypton atoms. As you may recall from high school chemistry it is these electrons that allow basic bonds to [...]

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