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Author Question: Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about ... (Read 64 times)

09madisonrousseau09

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on: Jul 27, 2018
Suppose you see two stars: a blue star and a red star. Which of the following can you conclude about the two stars? Assume that no Doppler shifts are involved. (Hint: Think about the laws of thermal radiation.)
 
  A) The red star is more massive than the blue star.
  B) The blue star is more massive than the red star.
  C) The blue star is farther away than the red star.
  D) The blue star has a hotter surface temperature than the red star.
  E) The red star has a hotter surface temperature than the blue star.

Question 2

According to general relativity, what is a black hole?
 
  A) an object that cannot be seen
  B) a place where light travels slower than the normal speed of light
  C) a place where the strength of gravity is infinite
  D) a hole in the observable universe


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vickyvicksss

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

D

Answer to Question 2

D


09madisonrousseau09

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

helenmarkerine

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Reply 3 on: Yesterday
Excellent

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