GCSE_AQA_Paper_1

2. Time taken for half the unstable nuclei in a radioactive sample to decay.
5. Energy required to change the state of 1 kg of a substance without changing its temperature.
6. Energy required to raise the temperature of 1 kg of a substance by 1°C.
8. Energy transferred per coulomb of charge.
11. Rate of flow of electric charge.
15. Radiation consisting of two protons and two neutrons emitted from a nucleus.
18. Number of protons in the nucleus of an atom.
19. Presence of unwanted radioactive material on or inside an object.
20. Total number of protons and neutrons in the nucleus of an atom.

1. Splitting of a large unstable nucleus into two smaller nuclei, releasing energy.
3. Measure of how difficult it is for electric charge to flow.
4. High-frequency electromagnetic radiation emitted from a nucleus.
7. Rate at which energy is transferred or work is done.
9. Exposure to ionising radiation from a source.
10. Energy transferred when a force moves an object through a distance.
12. Total kinetic and potential energy of all the particles in a system.
13. Useful output energy divided by total input energy.
14. Radiation consisting of a fast-moving electron emitted from a nucleus.
16. Atoms of the same element with different numbers of neutrons.
17. Mass per unit volume of a substance.