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John Burk

How to see around corners : Nature News & Comment - 0 views

www.nature.com/...-to-see-around-corners-1.10258

video optics reflection laser physics

shared by John Burk on 21 Mar 12 - No Cached
  • John Burk on 21 Mar 12
     
    How to see around corners Ultra-fast camera can create images of hidden objects using scattered laser light.
John Burk

Onset of Electrical Resistance Measured for First Time | Wired Science | Wired.com - 0 views

www.wired.com/...electrical-resistance-speed

resistance circuits voltage video physics

shared by John Burk on 21 Dec 11 - No Cached
  • Using a fast-pulsing laser, physicists have recorded the first moments of electrical resistance, the friction that generates heat as electricity travels through circuits.
  • Physicists knew electrical resistance didn’t kick in the moment a voltage was applied. Electrons experience some freedom before slowing to a crawl and scattering. What wasn’t certain was how quickly they make that transition (illustrated in the animation above, with electrons in blue, “electron holes” left by departing electrons in red, and voltage signified by the green arrow).
  • John Burk on 21 Dec 11
     
    post contains very interesting video simulation showing electrons in a semiconductor responding to the applied voltage. 
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