Bats fly and catch insects in the dark by sending out sounds and listening for the echoes. These sounds are

ultrasonic, above 20,000 HzCorrect answerYour answerinfrasonic, below 20 HzCorrect answerYour answerordinary audible sounds, between 20 Hz and 20,000 HzCorrect answerYour answerradio wavesCorrect answerYour answer

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CorrectNot quiteAnswer A

Correct answer: A

Bats emit very high-frequency squeaks, beyond what humans can hear.
The echoes from obstacles and prey tell the bat where they are. This is echolocation.

Worth noting

Radio waves are electromagnetic, not sound; a bat's echo is a sound wave.

Concept: Ultrasound and echolocation
Typical timeTypical: 60 s
Your timeYours: —

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Bats fly and catch insects in the dark by sending out sounds and listening for the echoes. These sounds are

Explanation