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Author Question: The fact that Venus' atmosphere contains carbon dioxide was discovered: A) by the Magellan ... (Read 64 times)

joe

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on: Jul 27, 2018
The fact that Venus' atmosphere contains carbon dioxide was discovered:
 
  A) by the Magellan spacecraft.
  B) in early spectroscopic studies.
  C) by the Venera spacecraft.
  D) in radar studies.
  E) through CCD imagery.

Question 2

Which has a greater luminosity, a star with absolute magnitude +4 or a star with absolute magnitude -6? By how much is it brighter?
 
  What will be an ideal response?


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Carliemb17

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

B

Answer to Question 2

A star with absolute magnitude -6 is intrinsically more luminous than a star with magnitude +4. The difference is 10 magnitudes, so the difference in luminosity is a factor of 100 for the first 5 magnitudes and a factor of 100 for the second 5 magnitudes, making an overall difference of a factor of 1002 = 10,000.


joe

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

bigcheese9

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Reply 3 on: Yesterday
Excellent

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