Which change occurs in the nucleus of a radioactive atom during β+\beta^+β+-emission (positron decay)?
A proton transforms into a neutron and a positron.
A proton transforms into a neutron only.
A neutron transforms into a proton and a positron.
A neutron transforms into a proton only.
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.