A radioactive isotope has an initial activity \({A_0}\) and a half-life of 1 day. The graph shows how the activity \(A\) varies with time.

The ratio \(\frac{{{A_0}}}{{{A_2}}}\) is equal to which of the following?

A.     \(\frac{{{A_1}}}{{{A_3}}}\)

B.     \(\frac{{{A_0}}}{{{A_3}}}\)

C.     \(\frac{{{A_0}}}{2}\)

D.     \(\frac{{{A_3}}}{3}\)

A

The diagram was not drawn strictly to scale, but this did not confuse the majority of the students.