A β+\beta^+β+ particle is a fast-moving positron.
Which statement explains how β+\beta^+β+ particles are emitted from an atom?
A proton changes into a neutron and a β+\beta^+β+ particle is emitted from the nucleus.
A neutron changes into a proton and a β+\beta^+β+ particle is emitted from the nucleus.
An electron in an inner shell is converted into a positron and is emitted from the atom.
A positron is ejected from an outer electron shell of the atom.
120 exam-style questions on CIE IGCSE Physics 5.2.3a Radioactive decay. Each one has a worked solution and a mark scheme showing where the marks go.