Across
- 5. The difference between the mass of a nucleus and the masses of its component nucleons
- 7. Nuclides that contain the same number of protons (and are thus the same element) but different numbers of neutrons
- 8. Quantities that have magnitude and direction
- 9. Helium nuclei (two protons and two neutrons) emitted as a result of a decaying unstable nucleus
- 10. The difference in electrical energy per unit test charge between the points
- 12. The phenomena by which electrons are emitted from the surface of some metals when the surface is illuminated with electromagnetic radiation (typically UV)
- 13. When two bodies A and B interact, the force that A exerts on B is equal and opposite to the force that B exerts on A
- 14. The spontaneous emission of ionizing radiations (alpha, beta, or gamma) from an unstable nucleus
- 16. A material that allows the flow of charge through it
- 17. A nuclear reaction in which small nuclei are induced to join together into larger nuclei and energy is released in the process
- 20. A unit of energy used on the atomic scale
- 21. Scientist whose model of the hydrogen atom assumes that electrons in the atom may be described by wavefunctions
- 22. The product of the force and the component of the displacement of the point of application of the force on the object that is in the same direction as the force
- 23. Scientist whose hypothesis stated that all moving particles have a ‘matter wave’ associated with them
- 24. The ratio between the speed of the wave in a vacuum and the speed of the wave in the medium
- 25. An object continues in uniform motion in a straight line or at rest unless a resultant external force acts
- 27. Waves that involve oscillations that are perpendicular to the direction of energy transfer
Down
- 1. The product of an object’s mass and its velocity
- 2. Quantities that only have magnitude
- 3. Rate of change of displacement in a particular direction
- 4. The distance from the origin in a particular direction
- 6. The amount of energy per unit mass absorbed or released during a change of phase
- 10. The force per unit charge on a test point charge placed at that location
- 11. Rate of change of velocity in a particular direction
- 15. The ratio of useful energy to the total energy transferred, often expressed as a percentage
- 18. The time taken for the number of nuclei that are available to decay to halve to its original value
- 19. The number of completed oscillations in a given period of time
- 26. The points on a longitudinal wave where all the particles are ‘far apart’ (low pressure)