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The spectral line emitted by a star, kno...

The spectral line emitted by a star, known to have a wavelength of 6500 Å.What is the speed of the star in the line of sight relative to the earth ? Is the star approaching or receding ? Speed of light in air`=3xx10^(8) ms^(-1)`.

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The correct Answer is:
`1.15xx10^(6) ms^(-1)`, receding
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