The Emission of Visible Light from Cavitated Liquids

  • Leslie A. Chambers
    Johnson Foundation for Medical Physics and Department of Pediatrics, University of Pennsylvania

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<jats:p>Emission of visible light from a number (14) of pure liquids and from some aqueous and nonaqueous solutions occurs during cavitation by intense sound waves of 8900 c.p.s. The intensity of the visible components of the radiation varies directly with the numerical product of viscosity (in poise) and dipole moment (in Debye units) and inversely with the temperature. In the case of polar solutes in nonpolar solvents the intensity varies with the concentration of the dipole. The light originates in cavitated areas or at the surface of the cavities, and is therefore proportional to the amount of cavitation, and in consequence, to the acoustic power input.</jats:p>

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