Physics Homework

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Across
  1. 3. ultrasound is reflected by _____ between soft tissue or bone
  2. 4. _____ is called as breaking sound barrier
  3. 8. ship have _____ that produce ultrasound
  4. 10. _____ is one of skydiver that travel faster than Mach 1
  5. 11. you will see the light of thunderstorm before the sound because it takes time for the sound to travel from the storm _____ to your ears
  6. 16. echo is _____ reflection of sound waves
  7. 17. distinctive sound that instrument make
  8. 18. example of a string instruments
  9. 19. starting pistols have electronic signal that connected to a microphone that ______ signal to loudspeakers
  10. 20. loudspeakers are more important in _____ races
Down
  1. 1. we see the fetus by taking _____
  2. 2. echoes can be _____ in concert halls
  3. 5. echolocation is used by dolphin when dolphin make a series of _____
  4. 6. the return of echo in ship are detected by _____
  5. 7. _____ walls are covered by soft materials
  6. 9. _____ is a process of muddying sound
  7. 12. waves can be produced when there is a box _____ the string
  8. 13. rope with weight in the end called _____
  9. 14. _____ reflects fetus and transmits ultrasound
  10. 15. when there is echo,sound _____ surfaces