Sahasra's Sound crossword puzzle

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Across
  1. 2. _______ strings produce lower sounds
  2. 4. the ________ of molecules produces sound
  3. 6. ________ the speed of sound in feet
  4. 10. _______ is how loud or soft sound is
  5. 11. ________ sound wave that starts with a L.
  6. 13. _______ is a back and forth motion
  7. 14. _______ the frequency higher the pitch
  8. 16. ______ the decibel the louder the sound
  9. 17. _______ travels slower than light
  10. 18. _______ the decibels the softer the sound.
  11. 19. _______ strings produce louder sounds
  12. 20. _____ bats, whales, dolphins use this
Down
  1. 1. ________ sound wave that starts with a C.
  2. 3. ______ is used to measure volume
  3. 5. ______ is a form of energy
  4. 7. ________ sound uses medium to do what?
  5. 8. ________ the speed of sound per sec in meters.
  6. 9. ______ sound needs this to travel.
  7. 12. ________ travels faster then sound
  8. 15. ________ the amplitude the louder the sound