The half-life of a radioactive nuclide is 20 years. If a sample of this nuclide has an activity of 6400… · ABC26IN0734

Subject: Inorganic Chemistry · Chapter: Nuclear Chemistry · Topic: Radioactive Decay Kinetics · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium

The half-life of a radioactive nuclide is 20 years. If a sample of this nuclide has an activity of 6400 disintegrations per minute (dis/min) today, its activity (dis/min) after 100 years would be
(a)850
(b)1600
(c)200
(d)400
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
100 years = 5 half-lives: 6400/2⁵ = 200 dis/min.

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