Sound Energy

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Across
  1. 2. First one to try and measure the speed of sound: Pierre ____________
  2. 5. An __________ region of air is usually needed to make the sound louder (amplified)
  3. 12. Music note with a wavelength of about 1.3 metres
  4. 13. Musical instrument that works by air being blown across a thin wooden reed
  5. 16. When sound is repeatedly reflected from hard surfaces
  6. 17. Where air particles in a sound wave are further apart than normal
  7. 18. The higher the frequency the longer the ___________
  8. 20. 340m/s is the accepted value of the speed of what?
  9. 21. Unit of frequency
Down
  1. 1. Moving compressions and rarefactions in air
  2. 3. Musical instrument that is a long tube for air to vibrate in
  3. 4. All sounds are caused by ____________
  4. 6. The frequency of sound determines its _______
  5. 7. Louder sounds have a greater __________
  6. 8. Sound can't travel through empty ________
  7. 9. Where air particles in a sound wave are closer together than normal
  8. 10. Often used to absorb sound in theatres
  9. 11. Like _______, sound can be transmitted, reflected, or absorbed
  10. 12. A device used to covert sound into electrical energy
  11. 14. When blown across, a short straw vibrates ________ than a long one
  12. 15. A low sound has a lower ___________ than a high sound
  13. 19. Musical instrument that works by plucking its strings