Nuclear physics
187 past-paper questions on Nuclear physics · examined 2020–2025.
20258 questions
Which description of the structure of an atom is correct?
A radioactive source is placed 20 mm in front of a detector. The count rate from the source is 2000 counts / minute. With a thin sheet of paper between the source and the detector, the count rate is 2000 counts / minute. With a sheet of aluminium 5 mm thick between the source and the detector, the count rate is 1200 counts / minute. Which radioactive emissions are coming from the source?
Which type of radiation is measured using a detector connected to a counter?
A sample of a radioactive isotope contains 100 nuclei of the isotope. The graph shows the number of nuclei of that isotope that remain in the sample as time passes. What is the half-life of the radioactive isotope?
A teacher does an experiment to measure radiation passing through a lead sheet. Three students suggest how the teacher can reduce the risk to her health. Which students are correct?
When a thin gold foil is bombarded with alpha particles, some alpha particles are deflected through large angles. Which statement explains this deflection?
A detector near a radioactive source shows a reading of 2000 counts / minute. How is the corrected count rate determined?
Which statement about alpha, beta and gamma radiation is not correct?
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