Question
Half-lives of two radioactive substances A and B are respectively 20 minutes and 40 minutes. Initially the samples of A and B have equal number of nuclei. After 80 minutes the ratio of remaining numbers of A and B nuclei is - 1 : 16
- 4 : 1
- 1 : 4
1 : 1
1 : 1
Solution
C.
1 : 4
