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Nuclear and particle physics

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Question 1

A sample of a radioactive isotope has a half-life of $T$ . After a time interval of $t = 6 T$ has elapsed from the start of an experiment, the number of undecayed nuclei remaining in the sample is $N$ .

How many nuclei of this isotope decayed during the time interval between $t = 2 T$ and $t = 6 T$ ?

$16 N$

$15 N$

$48 N$

$63 N$

Nuclear and particle physics Questions

A Level
Physics
Nuclear and particle physics