Based on Table N, which statement compares the half-lives and decay modes of krypton-85 and potassium-42?
- Jan 11
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Regents Chemistry Exam August 2025 Question 49
49 Based on Table N, which statement compares the half-lives and decay modes of krypton-85 and potassium-42?
(1) They have the same half-life and the same decay mode.
(2) They have the same half-life but different decay modes.
(3) They have different half-lives but the same decay mode.
(4) They have different half-lives and different decay modes.
Solution:
All we need to do is to find Table N on the Reference Table and check the half life and decay mode for each isotope given. Kr-85 has a beta decay mode and half life of 10.73 years. K-42 has a beta decay mode and a half life of 12.36 hours. Choice 3 is the correct answer.
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