Light from a nearby galaxy is emitted at a wavelength of 657 nm and is observed on…

PHYSICS · Multi-part · A Level · Physics · Waves · Waves

Problem

Light from a nearby galaxy is emitted at a wavelength of 657 nm and is observed on earth at a wavelength of 654 nm. (a) Deduce the speed of this galaxy. (b) State what, precisely, can be deduced about the direction of the velocity of this galaxy.

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