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The half period of a radioactive element...

The half period of a radioactive element is 20 years. If a sample of this nucleide has an initial activity of 20000 dis/min, the activity after 80 years would be:

A

2500 dis/min

B

5000 dis/min

C

20,000 dis/min

D

1250 dis/min.

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The correct Answer is:
D
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