Q:

A particular radionuclide has a half-life of six hours. When first measured, its activity is 10,000 Bq. Twelve hours later, what will its activity be?

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A particular radionuclide has a half-life of six hours. When first measured, its activity is 10,000 Bq. Twelve hours later, what will its activity be?


  1. 0 Bq
  2. 1250 Bq
  3. 2500 Bq
  4. 5000 Bq

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C: After one half-life the starting activity of 10,00 Bq will be halved to 5000 Bq. After another half-life the activity will be halved again from 5000 to 2500 Bq.

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