What is the purpose of the gel that is spread over the skin before an ultrasonic imaging

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What is the purpose of the gel that is spread over the skin before an ultrasonic imaging procedure? [The speed of sound in the gel is similar to the speed in the body, while the speed in air is much slower. What happens to a wave at an abrupt change in wave speed?]
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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