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The 6563 A Ha line emitted by hydrogen in a star is found to be red shifted by 15 A. Estimate the speed with which the star is receding from the earth.

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The 6563 A Ha line emitted by hydrogen in a star is found to be red shifted by 15 A. Estimate the speed with which the star is receding from the earth.

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  1. Solution:

    Since the star is receding away, hence its velocity v is negative (i.e. if AA is positive, v is negative)

    Here, negative sign shows recession of star.

    Check the complete chapter with solutions.

    NCERT Solutions for 12th Class Physics: Chapter 10-Wave Optics