Re:Scientists Watch as Heat Moves at the Speed of Sound
by mcguire on Sunday March 24, 2019 @11:30AM
(#19476867)
A quick first impression question: how important is the laser interference? Could you do this with a multi-centimeter graphite rod, by heating one end?
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Re:Scientists Watch as Heat Moves at the Speed of Sound
by freethemullet on Sunday March 24, 2019 @02:09PM
(#19477745)
Laser interference is not required. The original second sound measurements in superfluid Helium used a geometry similar to the one you describe, where a heat source (as a pulse or periodic in time) is positioned at one end and the temperature is recorded at some point(s) along the sample.