Question: A distant galaxy emits light that has a wavelength of 434.1 nm. On earth, the wavelength of this light is measured to be 438.6 nm.

A distant galaxy emits light that has a wavelength of 434.1 nm. On earth, the wavelength of this light is measured to be 438.6 nm.

(a) Decide whether this galaxy is approaching or receding from the earth. Give your reasoning.

(b) Find the speed of the galaxy relative to the earth.

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