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Questions  >>  CBSE XII  >>  Physics  >>  Wave optics
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The $6563 A^{\circ}\; H _{\alpha}$ line emitted by hydrogen in a star is found to be red shifted by $15^{\circ}A$ Estimate the speed with which the star is receding from the earth .

$\begin{array}{1 1} -6.86 \times 10^5\;ms^{-1} \\ 6.86 \times 10^5 \;ms^{-1} \\ -6.86 \times 10^{-5} ms^{-1} \\ 6.86 \times 10^{-5} ms^{-1} \end{array} $

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