Question 47
Radioactivity and Nuclear Physics4 g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5 g of the material?
- A.1¼ days
- B.8¾ days
- C.30 days
- D.80 days.
Show the answer and explanation
Answer: C (30 days)
Explanation
0.5 g must remain: 4 → 2 → 1 → 0.5 g is three half-lives, 30 days.