The Blue hydrogen line has a frequency of 6.90 x 1014 Hz. What will be the observed wavelength of the blue line of a galaxy that is moving away from Earth at 0.4c?

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The Blue hydrogen line has a frequency of 6.90 x 1014 Hz. What will be the observed wavelength of the blue line of a
galaxy that is moving away from Earth at 0.4c?
Transcribed Image Text:The Blue hydrogen line has a frequency of 6.90 x 1014 Hz. What will be the observed wavelength of the blue line of a galaxy that is moving away from Earth at 0.4c?
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