Question on: JAMB Physics - 2022
An isotope has an initial activity of 120 Bq. 6 days later its activity is 15 Bq. What is half-life?
A
3 days
B
2 days
C
1 day
D
4 days
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Correct Option: B
Here's how to solve this problem:
1. **Understand Half-Life:** Half-life is the time it takes for the activity of a radioactive substance to reduce by half.
2. **Determine the Number of Half-Lives:** The activity decreased from 120 Bq to 15 Bq. Let's see how many half-lives this represents:
* 120 Bq -> 60 Bq (1 half-life)
* 60 Bq -> 30 Bq (2 half-lives)
* 30 Bq -> 15 Bq (3 half-lives)
So, there were 3 half-lives.
3. **Calculate the Half-Life:** The total time
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