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What will happen in a time of 7 hours, if a radioactive substance containing a very large number of atoms has an average life of 7 hours?

a
Half of the active nuclei decay
b
Less half of the active nuclei decay
c
More than half of the active nuclei decay
d
All active nuclei decay

detailed solution

Correct option is C

In one average life, i.e. at 7 hours, 63.2 % of the active nuclei will decay. Therefore, in a time of 7 hours, it can be considered that more than half of the active nuclei will decay.

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