Stars typically emit the red light of atomic hydrogen with wavelength 656.3 nm (called the H a
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Stars typically emit the red light of atomic hydrogen with wavelength 656.3 nm (called the Ha spectral line). Compute the wavelength of that light observed at Earth from stars receding directly from us with relative speed v = 10-3c, v = 10-2c, and v = 10-1c.
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