Megacycle Frequency Second Sound

Author: Notarys, Harris Anthony

Year: 1964

Degree: Dissertation (Ph.D.)

Advisor: Pellam, John R.

Committee Member: Unknown, Unknown

Option: Physics

DOI: 10.7907/560M-XZ14

Abstract

Generation and detection of second sound have been extended to 25 Mc/sec using a resonant cavity technique. Investigations show the attenuation coefficient of second sound is proportional to the square of the frequency up to 1.3 Mc/sec at 1.22°K, 4 Mc/sec at 1.47°K, and 10 Mc/sec at 1.9°K - 2.1°K in agreement with Khalatnikov's theoretical predictions and with previous low frequency measurements.

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