The formula relating speed, frequency, and wavelength of electromagnetic waves, v = f , was known before

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The formula relating speed, frequency, and wavelength of electromagnetic waves, v = f λ, was known before relativity was developed. Relativity has not changed this equation, but it has added a new feature to it. What is that feature?
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Conceptual Physics

ISBN: 978-0321568090

11th edition

Authors: Paul G. Hewitt

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