× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
a
5
k
5
c
5
B
5
l
5
C
4
s
4
a
4
t
4
i
4
r
4
New Topic  
sary sary
wrote...
Posts: 6
Rep: 0 0
10 years ago
If the half-life of a radioactive isotope is 3 million years what percent of the isotope is left after 9 million years.
Read 1510 times
1 Reply

Related Topics

Replies
wrote...
10 years ago
There will be 1/8th or 12.5% of the isotope left after 9 million years because that is enough time for 3 half lives. (1/2)*(1/2)*(1/2)=1/8=12.5%.
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1274 People Browsing
Related Images
  
 3612
  
 4809
  
 1169
Your Opinion
Where do you get your textbooks?
Votes: 372