A radioisotope 
with a halflife 
years decays to 
which is stable. A sample of the rock from a cave was found to contain 
and 
in the ratio 1 : 7. The age of the rock is
A
years
B
years
C
years
D
years
Text Solution
Verified by ExpertsThe correct answer is:
C
Number of nuclei at 
Number of nuclei after time 
0
x
(As per question)
or 
Remaining nuclei of isotope 
So three half lives would have been passed.
years 
years
Hence, the age of the rock is 
years.
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
A nucleus of mass number 189 splits into two nuclei having mass number 125 and 64. The ratio of rad…
A nucleus with mass number 240 breaks into two fragments each of mass number 120, the binding energ…
The energy equivalent of 0.5 g of a substance is [NEET 2020]
If radius of the nucleus is taken to be , then the radius of nucleus is nearly
In the nuclear emission stated above, the mass number and atomic number of the product respective…
When a uranium isotope is bombarded with a neutron, it generates , three neutrons and [NEET 2020]