Q. The sounds having frequency less than 20 Hz __?

A
Ultrasonic
B
Infrasound
C
Detosonic
D
Stereosonic
Solution:

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.

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