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What type of communication is used for underwater communication?

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What type of communication is used for underwater communication?

(a) Radio communication

(b) Microwave communication

(c) SONAR

(d) Satellite communication

This question was posed to me during an online exam.

My question is taken from Types of Electronic Communication in chapter Introduction to Electronic Communication of Avionics

1 Answer

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Right choice is (c) SONAR

Easiest explanation: SONAR or SOund Navigation and Ranging is the transmission of information using sound waves. Since seawater is saline, it shorts out the electrical field in the radio waves and hence radio communication cannot be used.

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