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Bat echolocation systems employ ____ modulation.

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Bat echolocation systems employ ____ modulation.

(a) amplitude

(b) frequency

(c) phase

(d) amplitude shift keying

The question was asked in a national level competition.

This is a very interesting question from Environment Awareness topic in chapter Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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Right choice is (b) frequency

Explanation: Bat echolocation system is an example of range accuracy adaption systems. It uses frequency modulation during emission to identify the target in its path.

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