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Home Q & A Board Science-Related Homework Help Physics Astronomy
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LM12345 LM12345
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6 years ago
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.

Question 2

In a binary system, the more massive star
 
  a. is at the center of mass.
  b. is farthest from the center of mass.
  c. is nearest the center of mass.
  d. follows the largest orbit.
  e. shows a larger Doppler shift in its spectral lines.

Question 3

A nanometer is
 
  a. a unit of frequency.
  b. a unit of energy.
  c. a unit of mass.
  d. a unit of length.
  e. a unit of resolving power.
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ReneRene
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6 years ago
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LM12345 Author
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6 years ago
Smart ... Thanks!
derya1234
wrote...

Yesterday
Good timing, thanks!
aznzergs
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2 hours ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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