What is the observed wavelength of the 656.3 nm (first Balmer) line of hydrogen emitted by a

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What is the observed wavelength of the 656.3 nm (first Balmer) line of hydrogen emitted by a galaxy at a distance of 2.40 ( 108 ly? Assume that the Doppler shift of Eq. 37-36 and Hubble's law apply.
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Fundamentals of Physics

ISBN: 978-1118230725

10th Extended edition

Authors: Jearl Walker, Halliday Resnick

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