× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
g
3
3
2
J
2
p
2
m
2
h
2
s
2
r
2
d
2
l
2
a
2
Home Q & A Board Science-Related Homework Help Physics Astronomy
New Topic  
Charlie Lem Charlie Lem
wrote...
Posts: 27
Rep: 0 0
2 years ago
How do we know that pulsars must be very small in size (radius)?
      
a. Only very small objects can beam radiation into space.
      
b. Some spin so rapidly that if they were larger in size, their surfaces would be moving faster than the speed of light.
      
c. We have measured their radii directly in high-resolution telescope images.
      
d. This is only a theory that has not yet been confirmed by observations.
      
e. Their small sizes are inferred from careful study of their spectra.
Read 143 times
1 Reply

Related Topics

Replies
wrote...
#1
Educator
2 years ago
Quote from: Charlie Lem (2 years ago)
b. Some spin so rapidly that if they were larger in size, their surfaces would be moving faster than the speed of light.
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1076 People Browsing
 120 Signed Up Today
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 8202
  
 312
  
 166
Your Opinion
Which is the best fuel for late night cramming?
Votes: 145
Previous poll results: What's your favorite math subject?