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The isotope nitrogen-13 has a half-life of 10 min. A sample initially contains 8.0 10 10 undecayed nuclei. a. Write down an equation to

The isotope nitrogen-13 has a half-life of 10 min. A sample initially contains 8.0 × 1010 undecayed nuclei.
a. Write down an equation to show how the number undecayed N depends on time t.
b. Calculate how many undecayed nuclei will remain after 10 min, and after 20 min.
c. Determine how many nuclei will decay during the first 30 min.

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