Radioactive emissions

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Question 11

Medium

A student investigates the emissions from a radioactive isotope using a Geiger-Müller (GM) tube and counter. The background count rate is first measured to be $(cpm)45\text{ counts per minute (cpm)}$ . $\nWith\nWith$ the radioactive source placed 2.0 cm from the window of the GM tube, the recorded count rate is $cpm980\text{ cpm}$ .

When a sheet of paper is placed between the source and the GM tube, the count rate drops to $cpm320\text{ cpm}$ .
When the paper is replaced by a 6 mm thick aluminium plate, the count rate drops to $cpm45\text{ cpm}$ . $\nWhich\nWhich$ types of radiation are emitted by the source?

Beta-minus ( $β−\beta^-$ ) and gamma ( $γ\gamma$ ) only

Alpha ( $α\alpha$ ) and beta-minus ( $β−\beta^-$ ) only

Alpha ( $α\alpha$ ) and gamma ( $γ\gamma$ ) only

Alpha ( $α\alpha$ ), beta-minus ( $β−\beta^-$ ), and gamma ( $γ\gamma$ )

Radioactive emissions

Question 11

Radioactive emissions Questions

Radioactive emissions

Question 11

Radioactive emissions Questions