Intelligent beings in a distant galaxy send a signal to earth in the form of an electromagnetic wave. The frequency of the signal observed on earth is 1.3% greater than the frequency emitted by the source in the distant galaxy. What is the speed vrel of the galaxy relative to the earth?

The speed of galaxy relative to the earth is

Explanation:

Given :

Observed frequency

Actual frequency  

For finding the speed of galaxy relative to the earth.

From the doppler effect of light,

Where , relative speed

Therefore, the speed of galaxy relative to the earth is

volume: 22

density: 7.04

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length