Waves

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Across
  1. 2. Waves with oscillations that are parallel to the direction of travel/energy transfer.
  2. 3. The angle of incoming waves always equals the angle of outgoing for this wave behaviour.
  3. 6. The distance from a point on one wave to the same point on the adjacent wave (ie. peak to peak or trough to trough).
  4. 9. An object will appear this colour if it emits all wavelengths equally.
  5. 10. Reflection from a smooth surface, in a single direction.
  6. 11. Used for television and global audio communications.
  7. 13. Waves with oscillations that are perpendicular to the direction of travel/energy transfer.
  8. 15. These waves travel fastest in solids and slowest in gasses.
  9. 19. Used in energy efficient lamps and for sun tanning.
  10. 21. Transverse waves that form a continuous spectrum of different frequencies and all travel at the same speed in a vacuum. Different parts of this spectrum are given different names.
  11. 22. The number of waves passing a given point each a second.
  12. 23. Waves that have a frequency higher than the upper limit of human hearing (20kHz).
  13. 24. The unit of frequency.
Down
  1. 1. The type of electromagnetic radiation our eyes can detect.
  2. 4. The speed at which energy is transferred through the medium. It is equal to the product of the wave’s wavelength and frequency.
  3. 5. A type of radiation that all objects emit and absorb. The hotter an object is, the more it emits.
  4. 7. Depending on the density of the material, light will slow down it travels through a medium, causing it to change direction.
  5. 8. This is determined by frequency and wavelength. It changes depending on which frequencies an object absorbs and reflects.
  6. 12. Reflection from a rough surface that results in scattering.
  7. 14. This animal can hear sounds in the frequency range of 20Hz to 20kHz.
  8. 16. An object will appear this colour if it absorbs all wavelengths of radiation incident on it.
  9. 17. Used for satellite communications and for heating up food.
  10. 18. The time it takes for one complete wave to pass a given point.
  11. 20. The maximum displacement of a wave from its undisturbed (equilibrium) position.