Question

Soundshaving frequency more than 20 Hz are called 

(a) Infrasonic

(b) Supersonic

(c) Ultrasonic

(d) None of these

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Answer 1

Answer:

I think the answer is (d) none of these

because hearing limit of human starts from 20Hz.. so more than 20hz means it's hearing limit

Answer 2

Answer:

None of these is the correct answer

Sounds bellow 20Hz is called as Infrasonic

Sounds above 20000Hz is called as Ultrasonic.

Supersonic is something different but I don't remember.

Hence the correct option is None of these..

Hope my answer helps you buddy!

Have a nice day ahead b

Bye ❤