Question

what are infrasonic and ultrasonic sound?

Answer 1

infrasonic => having frequency less than 20 hz.
ultrasonic=> having frequency more than 20000 hz

Answer 2

The sounds of frequency less than 20Hz are called infra sonics. The infrasonic sounds have below the lower limit of human hearing. The sound of frequency more than 20,000Hz are called ultrasonics. Ultrasonic sounds have a frequency above the upper limit of human hearing.

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