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Sahay Sir > Question Answers > NCERT Exemplar Class 12 > Physics > Chapter 10 - Wave Optics > The 6563 A^0 Hα ​sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed with which the star is receding from the earth.

The 6563 A^0 Hα ​sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed with which the star is receding from the earth.

The 6563 A^0 Hα ​sign line emitted by hydrogen in a star is found to be red-shifted by 15A^0 . Estimate the speed with which the star is receding from the earth.