Question
Question: Two radioactive substances X and Y initially contain equal number of nuclei. X has a half-life of 1 ...
Two radioactive substances X and Y initially contain equal number of nuclei. X has a half-life of 1 hour and Y has a half-life of 2 hours. After two hours, the ratio of the activity of X to the activity of Y is –
A
1 : 4
B
1 : 2
C
1 : 1
D
2 : 1
Answer
1 : 1
Explanation
Solution
Use A = 2t/TλN0