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How do you get the answer to the questions listed below?

How do you get the answer to the questions listed below?


[3] Light is gathered from a distant galaxy and one of the spectral lines of Calcium is observed at 413.26 nm when it should be 393.37 nm.


(a) Find the velocity of this galaxy (hint: Doppler formula).


(b) Find the distance to this galaxy (hint: Hubble Law).


Answer: 14,786 km/s, 205 Mpc




[4] Answer the questions about the two galaxies below.


(a) Find the velocity of a galaxy if it is 8.22 Mpc away.


(b) Find the distance to a galaxy if it is moving away at a speed of 50,000 km/s.




Answer: 592 km/s, 694 Mpc

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