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Author Question: Why is it that the quasars we see represent a time when the universe was younger? What will be an ... (Read 24 times)

xclash

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on: Jul 27, 2018
Why is it that the quasars we see represent a time when the universe was younger?
 
  What will be an ideal response?

Question 2

Which statement about seismic waves is TRUE?
 
  A) Only S waves can travel through liquid.
  B) P waves travel faster, and thus arrive sooner than do the S waves.
  C) In the shadow zones, neither type is observed.
  D) S waves can travel though the outer core, but P waves cannot.
  E) On the far side of the Earth, only the S waves on the surface can be detected.


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parshano

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Reply #1 on: Jul 27, 2018
Answer to Question 1

Quasars have very large redshifts, corresponding to large cosmological distances. Since the light they emitted travels at a finite velocity, it must have left the quasar many billions of years ago.

Answer to Question 2

B


xclash

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Reply 2 on: Jul 27, 2018
YES! Correct, THANKS for helping me on my review

nguyenhoanhat

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Reply 3 on: Yesterday
Wow, this really help

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