Most of the galaxies in the universe are observed to be movingaway from Earth. S

Question

Most of the galaxies in the universe are observed to be movingaway from Earth. Suppose a particular galaxy emits orange lightwith a frequency of 5000 x 1014 Hz. If the galaxy is receding from Earth with aspeed of 3175 km/s, what is the frequency of the light when itreaches Earth? Most of the galaxies in the universe are observed to be movingaway from Earth. Suppose a particular galaxy emits orange lightwith a frequency of 5000 x 1014 Hz. If the galaxy is receding from Earth with aspeed of 3175 km/s, what is the frequency of the light when itreaches Earth? If the galaxy is receding from Earth with aspeed of 3175 km/s, what is the frequency of the light when itreaches Earth?

Explanation / Answer

We know that              f ' = f ( 1 - v/c)                   = 5000 x 1014 ( 1 - 3.175x 106 / 3x108)                   = 4947 x 1014 Hz

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