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The Hα Spectral Line of Hydrogen Has a Wavelength of 656.3

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The Hα spectral line of hydrogen has a wavelength of 656.3 nm as measured in the laboratory.The Hα spectral line is observed in light from a distant star at a redshifted wavelength of 789.0 nm.If Hubble's law is valid for this star,estimate how far is it from Earth if the Hubble constant is 22 km/s per million light-years.(c = 3.00 × 108 m/s, 1 ly=9.461 x 1015 m , 1 y = 3.156 × 107 s)


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