Across
- 4. the change in direction of light rays when it bounces off something
- 6. produces light on its own
- 7. have the lowest energy and frequency, but the longest wavelength
- 8. rays, highest energy/frequency and shortest wavelength
- 10. does not produce its own light; can be seen only by using reflected light
- 11. commonly used to heat up food
- 14. the distance from one place in a wave to the next similar place on the wave
- 15. the rate of repetition of a wave
- 16. smallest quality (quantum) of energy which can be transported
- 18. the production of light from an electric current flowing through semi-conductors
- 19. light generated without heating the object
Down
- 1. waves that possess both electric and magnetic properties
- 2. generated by the energy released in a chemical reaction without a rise in temperature
- 3. the production of light from friction as a result of scratching or crushing
- 5. the production of light in a living organisms as a result of a chemical reaction
- 9. have a wavelength of 10-10 metres
- 12. absorbs ultraviolet light and stores some of that energy
- 13. the wave height/depth from the rest position of the wave to the rest/through
- 15. occurs when an object absorbs ultraviolet light (not visible to the eyes) and immediately releases the energy as visible light
- 17. the production of light as a result of high temperature