A student investigates the radiation emitted by a radioactive substance. A detector is placed near the source, and different absorbers are placed between the substance and the detector. The table below shows the counter readings, which have been corrected for background radiation:

\begin{array}{|c|c|} \hline \text{Absorber} & \text{Counter reading (counts per minute)} \\ \hline \text{None} & 240 \\ \hline \text{Thin paper} & 240 \\ \hline \text{Few mm of aluminium} & 95 \\ \hline \text{Several cm of lead} & 8 \\ \hline \end{array}

Which types of radiation are being emitted by the substance?

$α\alpha$ -particles and $β\beta$ -particles only

$α\alpha$ -particles and $γ\gamma$ -rays only

$β\beta$ -particles and $γ\gamma$ -rays only

$α\alpha$ -particles, $β\beta$ -particles, and $γ\gamma$ -rays

\begin{array}{|c|c|} \hline \text{Absorber} & \text{Counter reading (counts per minute)} \\ \hline \text{None} & 240 \\ \hline \text{Thin paper} & 240 \\ \hline \text{Few mm of aluminium} & 95 \\ \hline \text{Several cm of lead} & 8 \\ \hline \end{array}

Which types of radiation are being emitted by the substance?

$α\alpha$ -particles and $β\beta$ -particles only

$α\alpha$ -particles and $γ\gamma$ -rays only

$β\beta$ -particles and $γ\gamma$ -rays only

$α\alpha$ -particles, $β\beta$ -particles, and $γ\gamma$ -rays

5.2 Radioactivity

Question 40

Markscheme

5.2 Radioactivity

Question 40

Markscheme

5.2 Radioactivity

Question 40

5.2 Radioactivity Questions

5.2 Radioactivity

Question 40

5.2 Radioactivity Questions