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Q. What is the SI unit of radioactivity?
Answer: Becquerel
Notes: The System International of units (SI system) uses the unit of Becquerel (Bq) as its unit of radioactivity. 1 Becquerel is simply equal to 1 disintegration or decay per second.

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Question Number: 15 in Physics GK 23 - Atomic and Nuclear Physics Basics in above course in App.