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The underwater locator beacon fitted to a recorder transmits at

  • A.37.5 kHz
  • B.121.5 MHz
  • C.406 MHz
  • D.8.8 kHz

Answer: A

An acoustic pulse at that frequency propagates well in sea water and is detected by a towed or hand-held hydrophone. Radio frequencies such as 121.5 and 406 megahertz belong to emergency locator transmitters and do not travel through water.

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