Abstract
RECENT measurements1 of the absorption of ultrasonic waves in some unsaturated aldehydes over the frequency-range 100 kc./s. to 1 Mc./s. have shown that relaxation occurs in crotonaldehyde and cinnamaldehyde. If α is the absorption coefficient relating to the excess pressure of the sound wave, then in the absence of relaxation the quantity (α/f2) remains constant with frequency, f. In the region of a single relaxation having a relaxation time, τ, we have2: 
provided that the velocity dispersion is negligible. Here fc = 1/2πτ, and the parameters A and B depend upon temperature.
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References
De Groot, M. S., and Lamb, J., Trans. Farad. Soc., 51, 1676 (1955).
Lamb, J., and Pinkerton, J. M. M., Proc. Roy. Soc., A, 199, 144 (1949).
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DE GROOT, M., LAMB, J. Ultrasonic Relaxation in Unsaturated Aldehydes. Nature 177, 1231–1232 (1956). https://doi.org/10.1038/1771231a0
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DOI: https://doi.org/10.1038/1771231a0
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