Which part of the human ear collects the sound waves from the surroundings?

In _______________ it is irregular and non periodic.

High pressure regions of sound waves are known as  ________________________.

Which of the following sound waves has frequency 20 Hz to 20,000 Hz?

The sound which produces pleasant effects on our ears and mind is called _______________.

The pressure variations are turned into electrical signals by the ____________________ .

The pressure variations are turned into electrical signals by ______

An echo is heared from a distant cliff after an interval of 2 secs. If the speed of sound in air is 340m/s, calculate the distance of the cliff.

The function of pinna is :

Which of the following are correct :

(a) The part of the outer ear that is visible to us is called pinna.

(b) The middle ear is the cavity with three important ear bones.

(c) In the inner ear, the pressure variations are turned into electrical signals by the chochlea.