The newest 9 of 8 written questions. Open one to see it on the real paper.
State one other significant source of background radiation on the Earth.
See it on the paper →Americium‑241 has a half‑life of 430 years. Suggest why the long half‑life of americium‑241 is important for use in a smoke detector.
See it on the paper →Table 3.1 lists some radiations. Table 3.1 radiation ionising alpha (α) beta (β) gamma (γ) ✓ ultrasound ✗ X‑rays Put a tick ( ✓ ) in each row of Table 3.1 to show which radiations are ionising and a cross ( ✗ ) to show which radiations are not ionising. Two have been done for you.
See it on the paper →Describe one adverse effect of ionising radiations on living things.
See it on the paper →State one use of X‑rays in a hospital.
See it on the paper →On Fig. 12.1, draw the paths taken by a beta particle and a gamma ray as they pass through the electric field.
See it on the paper →The source used in Fig. 12.1 has a half‑life of 29 years. Calculate the time it will take for the activity of the source to drop to 12.5% of the original value. time = years
See it on the paper →When the sample of radioactive rock is removed from the detector, the detector continues to record some radiation. Explain this observation.
See it on the paper →The radioactive source is removed. State why the radiation detector continues to detect a small amount of radiation.
See it on the paper →Many found this calculation demanding, with few getting the correct answer of 87 years. The methodology was poorly understood.
— Examiner report, May/June 2023, 0654/41 Q12(a)(ii) (Cambridge)
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