Light and Sound

123456789
Across
  1. 1. The range of electromagnetic waves from radio waves to X-rays.
  2. 5. The direction energy is carried as a light wave moves forward.
  3. 6. A beam of light of a single wavelength.
  4. 7. The type of light that helps humans see the world.
  5. 8. A dark area where the light is blocked by an object.
  6. 9. A form of electromagnetic energy, some of which is visible.
Down
  1. 2. A type of wave that comes from the sun and may harm human skin.
  2. 3. A type of wave that forms an S shape.
  3. 4. A type of wave that is used in "night vision" equipment.