First slide

Radio activity

Question

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?

Easy

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

Solution

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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