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Physics Hard CSS FPSC Uploaded: 05 Aug 2026

What is the unit of measurement for radioactive activity equal to one nuclear disintegration per second?

  • A Gray
  • B Becquerel
  • C Sievert
  • D Rem
Correct Answer: Option B — Becquerel
Explanation:
The Becquerel is the SI unit of radioactivity named after Henri Becquerel defined as one nuclear disintegration per second and replaced the older unit Curie in the SI system.
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Submitted by: PaperMCQs
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