Certain characteristic wavelength in the...

Certain characteristic wavelength in the light from a galaxy in the constellation virgo are observed to be increased in wavelength, as compared with terrestrial sources, by about `0.4%`. What is the radial speed of this galaxy with respect to earth ? Is it approacing or receding ?

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The correct Answer is:

(a) `1xx10^(6)m//s`; (b) the galaxy is receding

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