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The observed wavelength of a spectral line from a nearby star is 3.33 X 10^ -7 -7

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The observed wavelength of a spectral line from a nearby star is 3.33 X 10^ -7 -7
m. This spectral line should have a wavelength of 3.85 x 10^ m. Therefore this star has a velocity of _______km/s.

 
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