Question
Question: A radio isotope has a half life of 10 sec. If initially there are 1000 isotopes in sample which are ...
A radio isotope has a half life of 10 sec. If initially there are 1000 isotopes in sample which are falling from rest from reference plane from a height of 3000 m. Find the number of nuclei in the sample when it is at a height of 1000m from the reference plane –
A
50
B
250
C
29
D
100
Answer
250
Explanation
Solution
Calculate the time when it reaches a height of 100 m, then use A = lN