A distant galaxy emits light that has a wavelength of 500.7 nm. Onearth, the wavelength of this lightis measured to be 503.7 nm.
(a) Decide whether this galaxy is approachingorreceding from the earth.

1
This galaxy is receding from theearth. This galaxy is approachingtheearth.

Give your reasoning.
2
(b) Find the speed of the galaxy relative to the earth.
3 m/s

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Jean KeelingLv2

21 Jan 2019

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