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A block having 12 g of a radioactive ele...

A block having 12 g of a radioactive element is placed in a room. This half - life of the radioactive element is 15 years. After how many years there will be just 1.5 g of the element in the box?

A

40 year

B

45 year

C

20 year

D

15 year

Text Solution

Verified by Experts

The correct Answer is:
B
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