Author Question: The fact that Venus' atmosphere contains carbon dioxide was discovered: A) by the Magellan ... (Read 39 times)

joe · **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?

Carliemb17 · **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.