Q. Which radioactive element is used in smoke detectors?

  • (A) Uranium
  • (B) Plutonium
  • (C) Americium-241
  • (D) Thorium
✅ Correct Answer: (C) Americium-241
Explanation: Americium-241 emits alpha particles that ionize air, helping detect smoke in alarm systems.

Published by Tina Singh ⭐ 14.41K Points at 11-Oct-2025 08:52 am in Physics

Explanation by: Tina Singh
Americium-241 emits alpha particles that ionize air, helping detect smoke in alarm systems.

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