An environmental scientist is assessing the ambient radiation level inside a newly constructed research laboratory situated directly on a granite bedrock formation.
State two naturally occurring sources of background radiation that will contribute to the daily exposure of a researcher working inside this laboratory.
81 exam-style questions on Edexcel GCSE Physics 6.1 Atomic structure and isotopes, covering 6.1.1 Structure of the atom, 6.1.2 Isotopes: atomic and mass number, 6.1.3 Sub-atomic particles: masses and charges, and 6.1.4 Electron orbits and energy changes. Each one has a worked solution and a mark scheme showing where the marks go.