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Q:

frequency of ultrasound is- 

  • 1
    < 20 Hz
  • 2
    > 20 Hz and < 20,000 Hz
  • 3
    < 20 Hz and> 20,000 Hz
  • 4
    > 20,000 Hz.
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Answer : 4. "> 20,000 Hz."

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GK General Science Questions

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