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Question: the h line is a prominent hydrogen spectral line often...

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The H𝛼 line is a prominent hydrogen spectral line often used by astronomers to measure redshift. For a source that is not moving, the wavelength of the H𝛼 line is 656.3 nm. A star is moving away from Earth at a velocity of 53.7 km/s. What change in wavelength (Δ𝜆) will an astronomer on Earth measure for the H𝛼 line?

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