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MHT CET Physics question

PhysicsWavesMHT CET

The spectral line emitted by a star, has a wavelength of Å when observed from a lab appears to have a wavelength Å. Speed of star in the line of light relative to earth for receding or approach is given by

Answer: (D)

Solution

The observed wavelength is longer (red shift), so the star is receding, with $v≈

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Question ID VK-077276