Sound, Light, and Color Crossword

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Across
  1. 1. The frequencies of a wave
  2. 4. Sound waves with frequencies below the limit of human hearing
  3. 5. The properties of a room that determines how sound is transmitted
  4. 6. The part of the Electromagnetic Spectrum that is visible to humans
  5. 9. A wave with a shorter wavelength than x-rays
  6. 10. A wave between ultraviolet light and gamma rays
  7. 11. A wave that's shorter than a normal radio wave but longer than infrared rays
  8. 12. A pattern of beats and sounds
  9. 13. A unit used to measure the intensity of a sound
  10. 15. The extention of sound by reflection from a surface
  11. 17. An object that is see-through
  12. 20. When a person is not able to distinguish colors
  13. 21. Wavelengths shorter than light but longer than X-rays
  14. 22. Frequency modulator
  15. 23. The force or loudness of a sound
Down
  1. 2. A ray of radiation that produces a thermal effect
  2. 3. How high or low a sound is
  3. 7. The range of wavelengths and frequencies
  4. 8. A sound or vibration with an ultrasonic frequency
  5. 13. An increase or decrease in the frequency of sound as the source moves toward or away from an object or person
  6. 14. A single noise
  7. 15. A continuing effect; a repercussion
  8. 16. An electromagnetic wave that's used for long-distance communication
  9. 18. Amplitude modulator
  10. 19. Tiny fluctuations in the air