Top Posters
Since Sunday
k
4
c
4
M
3
t
3
i
3
B
3
k
3
m
3
c
3
o
3
l
3
r
3
Home Q & A Board Science-Related Homework Help Physics
New Topic  
doit_the_clown doit_the_clown
wrote...
Go to Answer
Posts: 1408
Rep: 0 0
7 years ago
A Cepheid variable star with a pulsation period of a few days is seen in the spiral arm of a galaxy. Its apparent brightness is measured as 104 times fainter than an equivalent star 1000 ly away from the Sun in our Galaxy. Assuming no light absorption between galaxies, what is the distance to the far Cepheid and hence to the galaxy?
A)   107 ly (104 times farther away)   C)   10 ly (100 times closer)
B)   10,000 ly (10 times farther away)   D)   100,000 ly (100 times farther away)
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
Authors:
Read 103 times
1 Reply
Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
Replies
Answer verified by a subject expert
discovererdiscoverer
wrote...
#1
Top Poster
Posts: 1374
Rep: 30 0
7 years ago
Sign in or Sign up in seconds to unlock everything for free
More solutions for this book are available here
1

Related Topics

doit_the_clown Author
wrote...

7 years ago
Correct Slight Smile TY
Starfiew
wrote...

Yesterday
this is exactly what I needed
macbookpro1
wrote...

2 hours ago
This helped my grade so much Perfect
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1051 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 4453
  
 140
  
 1129
Your Opinion
How often do you eat-out per week?
Votes: 80
Previous poll results: What's your favorite math subject?