Why sonar is not used in air?

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Tags

  1. #waves
  2. #wavelength
  3. #water
  4. #versa
  5. #larger
  6. #radio
  7. #conclude
  8. #therefore
  9. #denser
  10. #ultrasonic
  11. #radar
  12. #sonar
  13. #unlike
  14. #medium
  15. #longer