The spectra of most galaxies show redshifts This means that their spectral lines

Question

The spectra of most galaxies show redshifts This means that their spectral lines 0 a. have frequencies that are lower than normal b have a higher intensity in the red part of the spectrum. OC have frequencies that are higher than normal o d always are in the red part of the visible spectrum. QUESTION 22 Which of the following is a consequence of Hubble's Law? O a The more distant a galaxy is from us, the faster it moves away from us 0b. The closer a galaxy is to us, the faster it moves away from us c. Al galaxies are moving away from us equaly fast O d. More distant galaxies appear younger QUESTION 23 Because nealy all galaxdies are moving eway from us, we must be located at the center of the universe 0 Yes·Hws were not at the center, our solar system would not survive the graveatonal lug from other b.Yes, t is impossible not to be at the center and have everything else move away from us No, the center of the universe is at the center of our galaxy. o d No, everything moves away 9om everything eise in an expanding universe and there is no unique center QUESTION 24 Suppose we look at a photograph of many galasies Assuming that al galaies formad at about the same time which galaxy in the picture is seen in the eadest (youngest) stage? @?Thw ene that is closest ,ous ob The one that appears largest in sice

Explanation / Answer

21. The answer is a= have frequencies that are lower than normal
If they show redshift means they have longer wavelengths than normal, which means they have lower frequency than the normal.

22. The answer is a=the more distant a galxy, the faster it moves away
Hubbles law states that redshift is directly proportional to distance away from us, which tells the answer

23. The answer is d
This is because our universe is an expanding type and we dont have a common center and everything moves away from each other.

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