Question

We cannot hear the sound above ______Hz,and they are called___.​

Answer 1

Answer:

We cannot hear the sound above _20 Hz,and they are called audible sound.

Answer 2

Answer:

Human beings can normally hear sounds with a frequency between about 20 Hz and 20,000 Hz. Sounds with frequencies below 20 hertz are called infrasound. Infrasound is too low-pitched for humans to hear. Sounds with frequencies above 20,000 hertz are called ultrasound.

Explanation:

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