Top Posters
Since Sunday
w
3
w
3
e
3
3
r
3
g
2
2
b
2
M
2
V
2
f
2
c
2
Home Q & A Board Science-Related Homework Help Physics
New Topic  
Tsync Tsync
wrote...
Go to Answer
Posts: 3450
Rep: 8 0
8 years ago
Ionization of hydrogen in H II regions is most visible at:
A) 12,367 nm, the Paschen alpha line.
B) 121.3 nm, the Lyman alpha ultraviolet line for 2-1 electron transition.
C) 21 cm in the radio region for the spin-flip of its electron.
D) 473.2 nm, the blue-green emission line for 4-2 electron transition.
E) 656.3 nm, Balmer alpha line for 3-2 electron transition.
Textbook 
Astronomy Today

Astronomy Today


Edition: 8th
Authors:
Read 222 times
3 Replies
Minoring in physics
Replies
Answer verified by a subject expert
RatatouilleRatatouille
wrote...
#1
Top Poster
Posts: 3710
Rep: 56 0
8 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

Tsync Author
wrote...
#2
8 years ago
Exactly what I needed Smiling Face with Open Mouth
Minoring in physics
wrote...
#3
8 years ago
Happy to help Slight Smile
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  416 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 5974
  
 87
  
 220
Your Opinion
What percentage of nature vs. nurture dictates human intelligence?
Votes: 437
Previous poll results: Do you believe in global warming?