Googling "frigorific rays" provides a quaint history lesson in itself, weighted to some extent in the self-delusion of an earlier time frame; but ... is there anything to it, in the way of scientific validity ?
Well, yes there is, and a good analogy might start in chemistry - http://en.wikipedia.org/wiki/Frigorific_mixture "A frigorific mixture is a mixture of two or more chemicals that reaches an equilibrium temperature that is independent of the temperature of its component chemicals before they are mixed." IOW ... 2+2 does not always equal four in terms of thermal mixtures. Moving on to waves and photons, we would need to find a similar kind of energy polarization, where the interaction of two entities proceeds to provide what is essentially 2+2=1... and guess what, it happens all the time (in the audible range). In fact, frigorific radiation would be a cancelling wave - which itself is just as energetic as is the wave to be nullified, but in the end both are reduced significantly. There is also a google entry for this phenomenon in another kind of sensory wave: http://en.wikipedia.org/wiki/Active_noise_control You can see why this would work with sound, where there are longer wavelengths and fewer distinct frequencies to manage. Heat is another story, with short wavelengths and a wide spectrum. In the end, a "frigorific ray" for blackbody radiation would not be a single frequency, but would need to provide specific frequencies of anti-noise for all of the spectrum, and at a very short wavelength. Plus the cancelling radiation would need to change in step with the lowering of temperature. This would involve the so-called T-wave, which is normally felt as heat - but it would presumably be the anti-noise of the blackbody frequencies associated with a particular temperature, and would require a digital signal that canceled thermal radiation at every stage of the reduction. Not impossible, perhaps, but very daunting... perhaps frigorific radiation will be routine when computers get to be about 1000 times more powerful (mid-terahertz, which is 15 years from now, if you apply the House version of Moore's law - a doubling every 18 months). Jones
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