A steep cliff west of Lydia's home reflects a 1020-kHz radio signal from a station that is

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A steep cliff west of Lydia's home reflects a 1020-kHz radio signal from a station that is 74 km due east of her home. If there is destructive interference, what is the minimum distance of the cliff from her home? Assume there is a 180 ° phase shift when the wave reflects from the cliff.
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Physics

ISBN: 978-0077339685

2nd edition

Authors: Alan Giambattista, Betty Richardson, Robert Richardson

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