Physics · Oct / Nov 2025 · Paper 11 · Question 37
5054Half-life
A smoke alarm contains a radioactive source, S. The useful emissions from S are blocked by a few centimetres of air. What is the useful radioactive radiation emitted by S?
- Aalpha and gamma
- Balpha only
- Cbeta and gamma
- Dbeta only
As printed in the paper
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Correct answer: B. alpha only
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