In certain areas of the UK with granite bedrock, such as Cornwall, the average annual background radiation dose is 7.8 mSv7.8\text{ mSv}7.8 mSv. By contrast, the average annual background radiation dose for the rest of the UK is 2.3 mSv2.3\text{ mSv}2.3 mSv.
Cosmic radiation is a form of background radiation that increases with altitude. A passenger on a single one-way flight from London to Los Angeles receives an additional cosmic radiation dose of 0.055 mSv0.055\text{ mSv}0.055 mSv.
Calculate the number of these one-way flights a passenger would need to take to be exposed to a radiation dose equivalent to the excess annual background radiation received by a resident in Cornwall compared to the rest of the UK.
16 exam-style questions on AQA GCSE Physics 4.3 Hazards and uses of radioactive emissions and of background radiation, covering 4.3.1 Background radiation, 4.3.2 Different half-lives of radioactive isotopes, and 4.3.3 Uses of nuclear radiation. Each one has a worked solution and a mark scheme showing where the marks go.