Sound, light and optics

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Across
  1. 3. / A convex lens is also known as a.
  2. 8. / Type of wave that can travel through a vacuum.
  3. 9. / Which electromagnetic radiation is in the middle
  4. 10. / Which electromagnetic radiation has the lowest frequency.
Down
  1. 1. / The change in wave frequency during the relative motion between a wave source and its observer.
  2. 2. / A reinforcement of sound in a vibrating body.
  3. 4. / What electromagnetic radiation is used with a heat lamp.
  4. 5. / What type of wave is a sound wave.
  5. 6. / A concave lens is also known as a.
  6. 7. / A unit of light energy.