Question: Certain wavelengths in the light from a galaxy in the constellation Virgo are observed to be 0.4% longer than the corresponding light from Earth sources.

Certain wavelengths in the light from a galaxy in the constellation Virgo are observed to be 0.4% longer than the corresponding light from Earth sources.

(a) What is the radial speed of this galaxy with respect to Earth?

(b) Is the galaxy approaching or receding from Earth?

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