Fundamental interactions and exchange particlesAQA A-Level Physics: Mind map

Exam questions on Fundamental interactions and exchange particles

1. Two electrons are fired towards each other in an evacuated chamber and are observed to repel one another.
   Explain why the repulsion between two electrons cannot be due to the exchange of a W⁻ boson.2 marks
2. Fluorine-18, used in medical imaging, decays by beta-plus emission. In its nucleus a proton changes into a neutron.
   Write the equation for the decay of the proton in the nucleus and show that charge is conserved.2 marks
3. In a heavy nucleus an inner-shell electron is captured by a proton, which changes into a neutron.
   Describe electron capture in terms of the fundamental interaction and the exchange particle involved, and give the equation for the process.3 marks