In the 1800s, the atom was considered to be a fundamental particle. Modern physics shows that this is not correct.
Describe the fundamental particles within an atom of nitrogen-15 (715N^{15}_{7}\text{N}715N). In your answer, state the composition of the hadrons.
The half-life of tritium (13H^{3}_{1}\text{H}13H) is 12.3 years12.3\text{ years}12.3 years (y\text{y}y).
Show that the decay constant λ\lambdaλ for this isotope is about 5.6×10−2 y−15.6 \times 10^{-2}\text{ y}^{-1}5.6×10−2 y−1.
Tritium-dating is a technique used to date vintage wine. The ratio of tritium to hydrogen in a bottle of aged wine is 35%35\%35% of the ratio in newly bottled wine. Calculate the age in years of the wine.
State one assumption made in the calculation in (ii).
