Two sources produce electromagnetic waves. Source B produces a wavelength that is three times the wavelength produced

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Two sources produce electromagnetic waves. Source B produces a wavelength that is three times the wavelength produced by source A. Each photon from source A has an energy of 2.1 × 10-18 J. What is the energy of a photon from source B?
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Physics

ISBN: 978-1118486894

10th edition

Authors: David Young, Shane Stadler

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