× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
c
6
r
4
c
3
m
3
h
3
1
3
n
3
s
3
d
3
c
3
a
3
r
3
Home Q & A Board Science-Related Homework Help Physics Astronomy
New Topic  
LM12345 LM12345
wrote...
Go to Answer
Posts: 463
Rep: 0 0
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.
Read 97 times
1 Reply
Replies
Answer verified by a subject expert
ReneRene
wrote...
#1
Top Poster
Posts: 592
Rep: 1 0
6 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

LM12345 Author
wrote...

6 years ago
Smart ... Thanks!
apelton
wrote...

Yesterday
Good timing, thanks!
fgarza2146
wrote...

2 hours ago
this is exactly what I needed
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1366 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 2551
  
 324
  
 122
Your Opinion
Previous poll results: Where do you get your textbooks?