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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.
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