The atoms of a gas are heated so that electrons move to energy levels further from the nucleus. The electrons later return to their original energy levels. What is observed from the gas?
The gas absorbs electromagnetic radiation as the electrons return.
The gas becomes positively charged as the electrons return.
The gas becomes negatively charged as the electrons return.
The gas emits electromagnetic radiation as the electrons return.
40 exam-style questions on AQA GCSE Physics 4.1 Atoms and isotopes, covering 4.1.1 The structure of an atom, 4.1.2 Mass number, atomic number and isotopes, and 4.1.3 The development of the model of the atom (common content with chemistry). Each one has a worked solution and a mark scheme showing where the marks go.