Why can humans NOT hear the sound produced by a bat?

Question

Why can humans NOT hear the sound produced by a bat? — Exam MCQ

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D. The frequency of bat sounds is above 20,000 Hz. — The correct choice is The frequency of bat sounds is above 20,000 Hz.. Sound behaviour is determined by wave properties such as frequency, amplitude, wavelength and the medium of propagation.

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A. The sound travels only in water.

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B. The frequency of bat sounds is below 20 Hz.

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C. The sound is too loud for humans.

Why can humans NOT hear the sound produced by a bat?

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