Multiple choice

The unit of measuring radioactivity is ____.

  1. plank

  2. einstein

  3. curie

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Curie is the traditional unit of radioactivity, defined as 3.7 × 10^10 disintegrations per second (originally based on the activity of 1 gram of radium-226). The SI unit is becquerel (Bq), where 1 curie = 3.7 × 10^10 Bq. Einstein and Planck are units used in photochemistry and quantum mechanics respectively, not radioactivity.

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