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A distant galaxy is moving away from Earth at a speed of 70,000 km/s. If a...

A distant galaxy is moving away from Earth at a speed of 70,000 km/s. If a star in that galaxy emits light at a wavelength of 450 nm, what is the wavelength of that light when it reaches Earth? Speed of light c= 300,000 km/s.

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Answer #1

Since the galaxy is moving away, the wavelength received at earth will be redshifted.

the velocity of the galaxy is v = 7 x 107 m/s

c = 3 x 108 m/s

Therefore

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