A row of 25000 identical atoms touching each other has a length of 5.0 μm5.0\ \mu\mathrm{m}5.0 μm. A model shows one of these atoms with a diameter of 4.0 cm.
What is the magnification of the model?
2.0×1052.0\times10^52.0×105
2.0×1082.0\times10^82.0×108
5.0×10−95.0\times10^{-9}5.0×10−9
8.0×1038.0\times10^38.0×103
103 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.