Science Unit Crossword

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Across
  1. 3. Cylinder cells called rods detect the presence of light
  2. 5. solid substance that completely block light rays and preventing any light to pass
  3. 6. Bioluminescence occurs in organisms where chemical reactions inside an organism provide energy for light
  4. 14. the law of reflection states that the angle of reflection equals the angle of incidence
  5. 15. the chemical reaction produces energetic particles that give off visible light energy
  6. 16. is a mirror that caves in.
  7. 18. An object that can be heated to such a high temperature that it emits visible light is known as an incandescent source of light.
  8. 21. the fundamental, non-mixed light wavelengths used to create the full spectrum of colors by adding them together
  9. 22. is the bending of light when it travels from one medium to another (like moving from air to water)
  10. 23. is a mirror that bulges out
  11. 24. the ray that bounces of the surface is the reflect ray
Down
  1. 1. when substances are not completely clear and not completely solid
  2. 2. phosphorescence is persistent emission of light following exposure to removal of source of radiant energy.
  3. 4. specialized photoreceptor cells in the retina (biology) that enable color vision and high-acuity, and 3D geometric shapes with a circular base tapering to an apex
  4. 7. the ray that comes from a light source and strikes the surface is the incident ray
  5. 8. a bundle of over 1 million nerve fibers that transmits visual information, encoded by the retina, to the brain.
  6. 9. Secondary colours are hues produced by mixing two primary colours in equal proportions
  7. 10. tubes are more expensive and more difficult to dispose of than incandescent bulbs. The mercury vapor and phosphor coating are also toxic
  8. 11. The ray model of light helps to explain properties of light, like the existence of shadows.
  9. 12. when light passes through clear substances, the rays continue their straight paths
  10. 13. reflection is the process in which the light strikes a surface and bounces back off that surface.
  11. 17. radiation is a transfer of energy spreading in all directions at once
  12. 19. the new direction of the light is called the angle of refraction
  13. 20. in very simple terms, light is the form of energy that you can see. The sun is a natural light source. It is the source of the most abundant and the least expensive light in the world.