# astronomy & space

posted by .

What is the redshift of a galaxy which lies at a distance of 50 mpc, asssuming that the hubble constant is H_0 = 67 km s^-1 Mpc^-1?

assume that the speed of light is c=3.0x10^5 Km s^-1 please answer to an accuracy of 2 sig figs. Thankyou.

• astronomy & space -

First get the speed of the galaxy away from the observer by multiplyiing distance by the Hubble constant. This will give you the velocity in km/s.

V = 50 Mpc *(67 km/s)/Mpc = 3350 km/s

The RELATIVE redshift is
(deltaL)/L = V/c

The absolute redshift, delta L, depends upon the wavelength you are observing.

## Similar Questions

1. ### Macroeconomics

Suppose the marginal propensity to consume is 0.75. What does this mean?
2. ### Science

I need to now in order which of these are big in order from biggest to smallest: Moon, Whirlpool Galaxy, Hubble Deep Feild Galaxies, Hubble Space Telescope, Pleiades Star, Cluster, Saturn Sun Then the distance from closest earth to …
3. ### Economics

IF income was transferred from individuals with a low MPC to those with a high MPC, aggregate demand would: a) Increase. b) Decrease. c) Stay the same. d) Increase or decrease, but not because of the MPC.
4. ### Macroeconomics

How would i approach this question? I don't necessarily want an answer. A "how to" would be better. (Simple Spending Multiplier) For each of the following values for the MPC, determine the size of the simple spending multiplier and
5. ### science

The brightest galaxy in the Bootes cluster of galaxies is found to have a redshift of 0.13. (Assume the speed of light, c, is 3.0 × 10 8 m s−1.) (i) Assuming the Hubble constant, H0, is 70 km s−1 Mpc−1 to two significant …
6. ### Science need help ?????///

An astronomer observes two galaxies, A and B, which have redshifts of: Galaxy A = 0.020 and Galaxy B = 0.010. Which galaxy is closest to us and what is its distance away from us?
7. ### Macro Consumption Question

(Simple Spending Multiplier) For each of the following values for the MPC (marginal propensity to consume), determine the size of the simple spending multiplier and the total change in real GDP demanded following a \$10 billion decrease …
8. ### Astrophysics

The Earth formed at a redshift of z∼0.53. That means that when our world was young, the universe was quite a bit smaller than it is today. The nearest galaxies to our own are around 10 kpc (kilo-parsecs) in size, lie at a distance …
9. ### Astronomy

A galaxy is receding away from us with a recession velocity of 100,000 km/s. What is the distance to this galaxy?
10. ### Astronomy

You see a galaxy which lies at distance D from the earth. You measure a flux from this galaxy of f. If you assume a mass-to-light ratio of r (i.e. r is the number of kilograms needed to generate one watt of radiation), derive an equation …

More Similar Questions