Physics Chapter 12 Crossword

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Across
  1. 3. anything faster than Mach 1
  2. 6. anything slower than Mach 1
  3. 8. the speed of sound in the air at 0 degrees Celsius
  4. 11. the threshold of ______ for humans is 1 W/m^2
  5. 14. the lowest and loudest frequency produced
  6. 16. the change in perceived frequency of sound due to relative motion between the source and the perceiver
  7. 17. the ____ scale relates perceived loudness to sound intensity
  8. 18. power carried by the sound per unit area
  9. 20. frequencies above 20000 Hz
Down
  1. 1. ____ pipes have antinodes on both ends for their standing waves
  2. 2. the decibel scale is _____
  3. 4. ___ pipes only have odd harmonics
  4. 5. blending or mixture of harmonics
  5. 7. sound travels fastest in ____
  6. 9. frequencies between 20 Hz and 20000 Hz are in the ___ range
  7. 10. the threshold of ______ for humans is 1*10^-12 W/m^2
  8. 12. sound travels faster in helium because the particles have less mass and thus less ____
  9. 13. frequencies below 20 Hz
  10. 15. in humans, the eardrum and the brain work together as the ____ of the sound
  11. 19. a pulsation in loudness heard when 2 sound waves of similar frequency are played simultaneously