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Bat echolocation system _____ on moving close to the target.

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Bat echolocation system _____ on moving close to the target.

(a) increases transmitted signal duration

(b) increases transmitted signal bandwidth

(c) decreases transmitted signal duration

(d) decreases transmitted signal bandwidth

I had been asked this question during an online interview.

My query is from Environment Awareness in division Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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Right choice is (c) decreases transmitted signal duration

Explanation: Bat echolocation systemadjusts emitted sound duration, bandwidth, and repetition rate during the process of target identification. It decreases transmitted signal duration on moving close to the target.

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