Across
- 6. the product of a force and the time for which it acts (impulse = Ft)
- 7. the rate of change of an objecis velocity
- 10. electrostatic charge
- 13. electromagnetic radiation emitted by an atomic nucleus during radioactive
- 14. radiation) of a single wavelength
- 17. a device used to prevent excessive currents flowing
- 18. describes a ray of light (or other
- 19. a substance that transmits heat very poorly or does not conduct electricity
- 21. the rate at which work is done or energy is transferred
Down
- 1. a flat object of uniform thickness
- 2. two or more electrical cells connected
- 3. (J) the SI unit of work or energy
- 4. a device for producing a narrow beam of light of a single colour or wavelength
- 5. a single cell
- 8. in series; the word may also be used to
- 9. (Q) the SI unit of electrical resistance
- 11. the average time taken for half the atoms in a sample of a radioactive material to decay
- 12. an electrically neutral particle found in the atomic nucleus
- 15. see solar cell
- 16. the property of an object that causes it to have a gravitational attraction for other objects, and that causes it to resist changes in its motion
- 20. (N) the SI unit of force; the force required to give a mass of 1 kg an acceleration of 1 m/s2