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Author Question: The _______________ of the moon is the period of time for the moon to complete a cycle of the lunar ... (Read 80 times)

cool

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on: Jul 27, 2018
The _______________ of the moon is the period of time for the moon to complete a cycle of the lunar phases and is approximately 29.5 days long.
 
  a. sidereal period
  b. saros cycle
  c. synodic period
  d. eclipse season
  e. umbral period

Question 2

The hydrogen lines in spectral type A stars
 
  a. are most narrow for supergiants.
  b. are most narrow for main sequence stars.
  c. can not be used to estimate the luminosity of the star.
  d. are very weak and difficult to see.
  e. are useful in determining the apparent magnitude of the star.


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medine

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

C

Answer to Question 2

A


cool

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Reply 2 on: Jul 27, 2018
Excellent

mammy1697

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Reply 3 on: Yesterday
Wow, this really help

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