A radioactive decay rate of radioactive elements is found to be 103 disintegrations per sec at a certain time. If the half-life of the element is 1 second. The decay rate after one second and after 3 seconds is_
Correct answer: A. 500, 125
- A. 500, 125
- B. 103, 103
- C. 125, 500
- D. 100, 10
Explanation
After 1 sec, 1 half-life will pass so, the remaining activity =103/21 = 500 After 3 sec, 3 half-lives will pass so, Remaining activity=103/23 =1000/8 =125
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