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The activity of a radioactive sample is measured as 9750 counts per minute at t = 0 and as 975 counts per minute at t = 5 minutes. The decay constant is approximately
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- 0.922 per minute
- 0.691 per minute
- 0.461 per minute
- 0.230 per minute
Correct Option: C
| = KN | dt |
9750 = KN0 .............(1)
975 = KN .............(2)
Dividing (1) by (2)
| = | ||||
| N0 | 10 |
| K = | log | = | log10 | |||
| t | N | 5 |
= 0.4606 = 0.461 per minute
