The graph below shows the decay curve for a 20.0-milligram sample of a radioactive isotope.
- Mayya Alocci
- Sep 26
- 1 min read
Regents Chemistry Exam June 2025 Question 50
50 The graph below shows the decay curve for a 20.0-milligram sample of a radioactive isotope.
What is the half-life of this isotope?
(1) 5.0 d
(2) 8.0 d
(3) 8.7 d
(4) 10.0 d
Solution:
The isotope starts with the mass of 20mg. Half life represents the time it takes for it to decay to 1/2 of its mass, which would be 10 mg. 10 mg is at around 8 days, Choice 2 is the correct answer choice.
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