O-LevelPhysicsNuclear PhysicsOct/Nov 2024Paper 1 Q371 Mark
During a radioactivity experiment, the background reading is 28 counts per minute. A radioactive source is placed 2 cm in front of a detector which is connected to a counter. [Figure] Counter readings are taken with and without sheets of different materials placed between the source and the detector. [Table: type of sheet (no sheet, thin card, 5 mm thick aluminium), reading/counts per minute (750, 750, 478)]. Which types of radiation are being emitted by the source?
Aalpha particles, beta particles and gamma rays
Balpha particles and beta particles only
Calpha particles and gamma rays only
Dbeta particles and gamma rays only
✓ Correct Answer
The correct answer is D: beta particles and gamma rays only
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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