[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

Question

[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.

Note: be sure to always use the formula sheet.

Answer: 592 km/s, 694 Mpc

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Sophia 2 weeks 2021-09-09T13:14:27+00:00 1 Answer 0

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    2021-09-09T13:15:33+00:00

    Answer:

    a) Velocity of the galaxy=573.756 km/s

    b) Distance to the galaxy=716 Mpc

    Step-by-step explanation:

    a) v=H_0 D\\Where\ v=Velocity\ of\ the\ galaxy\\H_0= Hubble\ constant=69.8\pm 1.9\ as\ of\ 16\ July\ 2019\\D= Proper\ distance=8.22\ Mpc\\\Rightarrow v=69.8\times 8.22\\\therefore v=573.756\ km/s\\

    b)v=H_0 D\\v=50000\ km/s\\H_0= Hubble\ constant=69.8\pm 1.9\\\Rightarrow D=\frac{v}{H_0}\\\Rightarrow D=\frac{50000}{69.8}\\\therefore D=716\ Mpc

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