Top Posters
Since Sunday
r
4
L
4
3
d
3
M
3
l
3
V
3
s
3
d
3
a
3
g
3
j
3
New Topic  
nyno2010 nyno2010
wrote...
Posts: 31
Rep: 0 0
11 years ago
A rock sample contains 75 atoms of a parent isotope and 25 atoms of a daughter isotope. The half-life of the parent isotope is 100 years. How old is this rock?

Answers:
a. 25 years old
b. 50 years old
c. 75 years old
d. 100 years old
Read 919 times
1 Reply
Replies
Answer accepted by topic starter
nypharmnypharm
wrote...
Posts: 24
Rep: 0 0
11 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  2050 People Browsing
Related Images
  
 380
  
 412
  
 395
Your Opinion
What's your favorite coffee beverage?
Votes: 303