Physics · Oct / Nov 2024 · Paper 12 · Question 37
5054The three types of emission
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. [diagram: source, sheet, detector, to counter, 2 cm] Counter readings are taken with and without sheets of different materials placed between the source and the detector. | type of sheet | reading / counts per minute | |---|---| | no sheet | 750 | | thin card | 750 | | 5 mm thick aluminium | 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
As printed in the paper
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Correct answer: D. beta particles and gamma rays only
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