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Author Question: The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because ... (Read 32 times)

charchew

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on: Jul 27, 2018
The total mass of the pair of stars in spectroscopic binaries are difficult to estimate because
 
  a. we can't measure the radial velocities of each star in the system.
  b. we can't see the shape or tilt of the orbit.
  c. we can't find the diameters of the stars.
  d. we can't determine the luminosities of the stars.
  e. the Doppler shift is not measurable.

Question 2

The optical shape of segmented mirrors is controlled by computer-driven thrusters under the mirrors in what is called
 
  a. an achromatic lens.
  b. active optics.
  c. a Schmidt-Cassegrain design.
  d. a Newtonian design.
  e. interferometry.


chevyboi1976

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

b

Answer to Question 2

b


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charchew

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Reply #2 on: Jul 27, 2018
TY


chevyboi1976

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Reply #3 on: Jul 27, 2018
You're welcome


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