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Sensory Evolution on the ThresholdAdaptations in Secondarily Aquatic Vertebrates$
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J. G. M. Thewissen

Print publication date: 2008

Print ISBN-13: 9780520252783

Published to California Scholarship Online: March 2012

DOI: 10.1525/california/9780520252783.001.0001

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PRINTED FROM CALIFORNIA SCHOLARSHIP ONLINE (www.california.universitypressscholarship.com). (c) Copyright University of California Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in CALSO for personal use.date: 20 September 2021

The Physics of Sound in Air and Water

The Physics of Sound in Air and Water

(p.174) (p.175) 11 The Physics of Sound in Air and Water
Sensory Evolution on the Threshold

Sirpa Nummela

J. G. M. Thewissen

University of California Press

This chapter analyzes the physics of sound and hearing in water and air. It describes the different aspects of sound, the ability of air and water to transmit sounds, and the opportunities and challenges that living in the two media presents to the organism. It first discusses sound detection through sound frequency, wavelength, and amplitude. It then describes acoustic impedance, the intrinsic resistance of a substrate or of a mechanism against transmitting sounds. It also examines sound localization, the mechanism used to determine the direction of a sound source. Finally, it discusses bone conduction, a mechanism of audition significant in aquatic sound reception.

Keywords:   sound, hearing, sound detection, acoustic impedance, sound localization, bone conduction, sound reception

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