What is the loudness of normal breathing?

The loudness of sound depends on :

Which of the following are stretched across the voice box?

Which vibrating part of  flute producing sound?

Animals can hear sound of frequencies :

What is the loudness of Busy traffic?

Ultrasound can be detected by

Sound can be produced by use of which of the following objects?

When the eardrum senses the vibrations of sound it sends the signals to the brain.This process is called

Loudness of sound increases by

I. The amplitude of vibrating body

II. The increase in surface area of vibrating body

III. The decrease in frequency of vibrating body

IV. The increase in distance from the source of sound