full transcript

From the Ted Talk by Jacques S. Abramowicz: How does ultrasound work?

Unscramble the Blue Letters


In a pitch-black cave, bats can’t see much. But even with their eyes shut, they can navigate rocky topography at idlbircnee sedpes. This is because a bat’s flight isn’t just gieudd by its eyes, but rather, by its ears. It may seem ibiomslspe to see with sonud, but bats, naval officers, and doctors do it all the time, using the unique properties of ultrasound.

All sound is certead when molecules in the air, water, or any other medium vibrate in a pulsing wave. The distance between each peak determines the wave’s frequency, measured as cycles per second, or hertz. This means that over the same amount of time, a high frequency wave will cmoletpe more cycles than a low frequency one. This is especially true of ultrasound, which includes any sound wave edixenecg 20,000 cycles per second.

Open Cloze


In a pitch-black cave, bats can’t see much. But even with their eyes shut, they can navigate rocky topography at __________ ______. This is because a bat’s flight isn’t just ______ by its eyes, but rather, by its ears. It may seem __________ to see with _____, but bats, naval officers, and doctors do it all the time, using the unique properties of ultrasound.

All sound is _______ when molecules in the air, water, or any other medium vibrate in a pulsing wave. The distance between each peak determines the wave’s frequency, measured as cycles per second, or hertz. This means that over the same amount of time, a high frequency wave will ________ more cycles than a low frequency one. This is especially true of ultrasound, which includes any sound wave _________ 20,000 cycles per second.

Solution


  1. guided
  2. incredible
  3. exceeding
  4. sound
  5. impossible
  6. complete
  7. created
  8. speeds

Original Text


In a pitch-black cave, bats can’t see much. But even with their eyes shut, they can navigate rocky topography at incredible speeds. This is because a bat’s flight isn’t just guided by its eyes, but rather, by its ears. It may seem impossible to see with sound, but bats, naval officers, and doctors do it all the time, using the unique properties of ultrasound.

All sound is created when molecules in the air, water, or any other medium vibrate in a pulsing wave. The distance between each peak determines the wave’s frequency, measured as cycles per second, or hertz. This means that over the same amount of time, a high frequency wave will complete more cycles than a low frequency one. This is especially true of ultrasound, which includes any sound wave exceeding 20,000 cycles per second.

Frequently Occurring Word Combinations


ngrams of length 2

collocation frequency
high frequency 2
ultrasound beams 2
sound waves 2
tightly packed 2
ultrasound waves 2
ultrasound machines 2
medical ultrasound 2


Important Words


  1. air
  2. amount
  3. bats
  4. cave
  5. complete
  6. created
  7. cycles
  8. determines
  9. distance
  10. doctors
  11. ears
  12. exceeding
  13. eyes
  14. flight
  15. frequency
  16. guided
  17. hertz
  18. high
  19. impossible
  20. includes
  21. incredible
  22. means
  23. measured
  24. medium
  25. molecules
  26. naval
  27. navigate
  28. officers
  29. peak
  30. properties
  31. pulsing
  32. rocky
  33. shut
  34. sound
  35. speeds
  36. time
  37. topography
  38. true
  39. ultrasound
  40. unique
  41. vibrate
  42. water
  43. wave