Key in the hearing numbers

Exercise and reference answers

Questions

1. Answer

   20

   Question

   Lowest frequency in hertz that a human ear can hear

2. Answer

   20000

   Question

   Highest frequency in hertz that a human ear can hear

3. Answer

   40

   Question

   Highest frequency in kilohertz used by an ultrasonic cleaner

4. Answer

   3

   Question

   Number of main sections the human ear is divided into

Instructions

Work out each answer, key it in on the pad, then tap Enter.

Explanation