0654.P5.2.04 — Know the following applications of radioactivity: (a). household fire (smoke) alarms (b). irradiating food to kill bacteria (c). sterilisati: past paper questions

Real questions on 0654.p5.2.04 — know the following applications of radioactivity: (a). household fire (smoke) alarms (b). irradiating food to kill bacteria (c). sterilisati

The newest 5 of 5 written questions. Open one to see it on the real paper.

1. 0973/31 · May/June 2026 · Q9c(iii)[1]

   (iii) Use the words electron, neutron and proton to complete the sentence describing the change in the nucleus that occurs during B-emission. .......... Changes into ..........

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2. 0973/41 · May/June 2026 · Q12b[3]

   Ascientist finds an old shell that they believe is 28500 years old. The scientist compares a sample of the old shell with a sample of the same mass from a living shell. The living shell measures a count rate of 307 counts / minute due to the decay of the radioactive isotope, carbon-14. The half-life of carbon-14 is 570...

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3. 0973/42 · May/June 2022 · Q12c(i)[2]

   Use the correct nuclide notation to complete the decay equation for uranium‑238. 238 92 U Th +

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4. 0973/42 · May/June 2021 · Q9c[2]

   The isotope of thorium produced is also unstable and decays releasing more ionising radiation. Fig. 9.1 shows how the activity of a sample of thorium-234 varies over time. 120 100 80 count rate / arbitrary units 60 40 20 0 0 50 100 150 time / days 200 250 Fig. 9.1 Use Fig. 9.1 to calculate the half-life of thorium-234....

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5. 0973/41 · May/June 2020 · Q9c(i)[2]

   Give two reasons why I-123 is suitable for use inside the body.

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