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Hydrophone vs Transponder - What's the difference?

hydrophone | transponder |

As nouns the difference between hydrophone and transponder

is that hydrophone is a transducer that converts underwater sound waves into electrical signals, rather like a microphone while transponder is a radio or radar transceiver that transmits some signal in response to receiving a predetermined signal.

hydrophone

English

Noun

(wikipedia hydrophone) (en noun)
  • a transducer that converts underwater sound waves into electrical signals, rather like a microphone

    • transponder

    English

    (wikipedia transponder)

    Noun

    (en noun)
  • A radio or radar transceiver that transmits some signal in response to receiving a predetermined signal.

    • See also

    * identification friend or foe ----