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Author Question: Two stars with about the same mass are found to have transiting planets with similar semi-major ... (Read 69 times)

ETearle

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on: Jul 27, 2018
Two stars with about the same mass are found to have transiting planets with similar semi-major axes. Star 1 exhibits a Doppler shift twice as large as Star 2. What can we determine about these two systems?
 
  A) The planet around Star 2 is more massive than the planet around Star 1.
  B) The planet around Star 1 has a thicker atmosphere than the planet around Star 2.
  C) The planet around Star 1 is more massive than the planet around Star 2.
  D) The planet around Star 2 has a thicker atmosphere than the planet around Star 1.

Question 2

Which of the following is not an observed characteristic of the cosmic microwave background?
 
  A) It contains prominent spectral lines of hydrogen, the primary chemical ingredient of the universe.
  B) It has a perfect thermal radiation spectrum.
  C) Its temperature is a little less than 3 Kelvin (3 degrees above absolute zero).
  D) Its temperature is the same everywhere, except for small variations at the level of 1 part in 100,000.


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juliaf

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

C

Answer to Question 2

A


ETearle

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

adammoses97

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Reply 3 on: Yesterday
Excellent

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