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Subject - Physics:

Basics

MCQ - 9-10476

Question:

The unit of radioactivity curie is equal to

  1. 3.74 x 109 disintegration per sec
  2. 3.70 x 1010 disintegration per sec
  3. 3.55 x 1010 disintegration per sec
  4. 3.70 x 1010 disintegration per sec

Correct Answer: B

Explanation:

One curie is roughly the activity of 1 gram of the radium isotope 226Ra, a substance studied by the Curies. The SI derived unit of radioactivity is the Becquerel (Bq), which equates to one decay per second. Therefore: 1 Ci = 3.7 × 1010 Bq = 37 GBq = 37,000,000,000 atoms decaying per second.

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