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Pos. | Name | Entered on | Points | Result |
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\[
\begin{array}{|l|l|}
\hline \text { Time/minute } & \text { Activity/ count } s ^{-1} \\
\hline 0 & 483 \\
\hline 30 & 363 \\
\hline 60 & 238 \\
\hline 90 & 180 \\
\hline
\end{array}
\]
The table shows the record of activity of a radioactive specimen in a period of 90 minutes. What is the half-life of the radioactive substance?
\[
\begin{array}{|c|c|}
\hline \text { Element X } & \text { Element Y } \\
\hline 20 g & 20 g \\
\hline 5 g & 5 g \\
\hline 5 & 35 \\
\hline 2.5 & 2.5 \\
\hline 2.5 & 37.5 \\
\hline
\end{array}
\]
The equation shows the disintegration of radioactive element X to become element Y (which is not radioactive). If the initial mass of X is 40g, determine the mass of X and Y after 1 hour. [Half-life of X is 15 minutes]
\[
\begin{array}{|c|c|c|}
\hline & \text { Element X } & \text { Element Y } \\
\hline A & 20 g & 20 g \\
\hline B & 5 g & 5 g \\
\hline C & 5 & 35 \\
\hline D & 2.5 & 2.5 \\
\hline E & 2.5 & 37.5 \\
\hline
\end{array}
\]
\[
\begin{array}{|l|l|l|}
\hline \begin{array}{l}
\text { Radioactive } \\
\text { substance }
\end{array} & \begin{array}{l}
\text { Initial mass } \\
\text { (gram) }
\end{array} & \text { Half-life (hours) } \\
\hline X & 128 & 6 \\
Y & 64 & m \\
\hline
\end{array}
\]
The table shows the initial mass of 2 radioactive substances X and Y and their half-life respectively. If the mass of X and Y become equal after 18 hours, find the value of m.
hours
The half-life of a radioactive sample X is 280 years. The mass of radioactive X is 32g. What was the mass of radioisotope X at 1120 years ago?
The diagram shows the graph of the activity of a radioisotope, X, against time. What is the half-life of the radioactive substance?
The diagram shows the number of remaining atoms, Z in a radioactive against time. How many atoms of Z are left after 30 days?
The half-life of radioisotope Z is 6 days. Which of the following graph correctly shows the rate of decay of P changes over time?
Figures below shows the decay curve of 4 different radioisotopes. Which radioisotope has the shortest half-life?