menu
QAmmunity.org
Login
Register
My account
Edit my Profile
Private messages
My favorites
Ask a Question
Questions
Unanswered
Tags
Categories
Ask a Question
If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is ___________ years old
asked
Apr 21, 2018
14.3k
views
1
vote
If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is ___________ years old
Chemistry
high-school
Atticus
asked
by
Atticus
8.3k
points
answer
comment
share this
share
0 Comments
Please
log in
or
register
to add a comment.
Please
log in
or
register
to answer this question.
1
Answer
4
votes
25% remaining =
40,000
years old
Dave Clements
answered
Apr 27, 2018
by
Dave Clements
7.4k
points
ask related question
comment
share this
0 Comments
Please
log in
or
register
to add a comment.
← Prev Question
Next Question →
Related questions
asked
Nov 8, 2024
35.1k
views
What is the half-life of a 0.5g sample of radioisotope that decayed 0.125g in 9.6min? A) 4.8 min B) 9.6 min C) 1.2 min D) 2.4min
Jinok
asked
Nov 8, 2024
by
Jinok
8.0k
points
Chemistry
high-school
1
answer
0
votes
35.1k
views
asked
Sep 20, 2024
151k
views
A sample of a radioisotope in a rock has decayed to 25 percent of its original radioactivity over a period of 12,000 years. the half-life of the radioisotope is a. 3,000 years. b. 4,000 years. c. 6,000
Raul Gonzalez
asked
Sep 20, 2024
by
Raul Gonzalez
8.1k
points
Chemistry
high-school
1
answer
1
vote
151k
views
asked
May 27, 2018
64.1k
views
The radioisotope cesium-137 has a half-life of 30 years. a sample decayed at the rate of 544 counts per minute in the year 1985. in what year will the decay rate be 17 counts per minute?
Carlo Wood
asked
May 27, 2018
by
Carlo Wood
8.4k
points
Chemistry
college
1
answer
1
vote
64.1k
views
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.
9.5m
questions
12.2m
answers
Other Questions
Compare and contrast an electric generator and a battery??
How do you balance __H2SO4 + __B(OH)3 --> __B2(SO4)3 + __H2O
Can someone complete the chemical reactions, or write which one do not occur, and provide tehir types? *c2h4+h2o *c3h8 + hcl *c2h2+br2 *c4h10+br2 *c3h6+br2
Why is gold preferred as a superior metal over silver and bronze?
What is the evidence of a chemical reaction when the fireworks go off
Twitter
WhatsApp
Facebook
Reddit
LinkedIn
Email
Link Copied!
Copy
Search QAmmunity.org