During a physics investigation at a school in Guyana, students place different materials between a radiation source and a detector. The count rate remains almost unchanged when paper and aluminium foil are placed in the path, but drops significantly when a thick lead block is used. The source is most likely emitting:

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Question

During a physics investigation at a school in Guyana, students place different materials between a radiation source and a detector. The count rate remains almost unchanged when paper and aluminium foil are placed in the path, but drops significantly when a thick lead block is used. The source is most likely emitting:

Accepted Answer

Gamma rays only — Award 1 mark for correct identification. Gamma rays pass through paper and aluminium with little absorption but are significantly absorbed by thick lead. A is incorrect — alpha particles would be stopped by paper. B is incorrect — beta particles would be significantly absorbed by aluminium foil. D is incorrect — both would be stopped before reaching the lead.

Answer

Gamma rays only

Answer

Alpha and beta particles

Answer

Beta particles only

Answer

Alpha particles only

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