WBCS.LIVE practice question

Infrasonic sounds have frequencies:

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. above 25 kHz
  2. between 20 kHz and 25 kHz
  3. below 20 Hz
  4. between 20 Hz and 20 kHz

Correct answer and explanation

Correct answer: below 20 Hz