The Human Ear


Sound II - Concepts
Class - 8th Foundation NTSE Subjects
 
 
Concept Explanation
 

The Human Ear

How our Ears catch sound: We have just learnt how sound vibrations from a source propagate through the air and reach out ears. Let us now discuss how our ears actually ‘hear’ these sound vibrations. The ear can be broadly classified into three parts: the outer ear, the middle ear, and the inner ear.

Outer ear:  The part of the outer ear that is visible to us is called pinna. The sound collected passes through auditary canal. At the end of auditory canal there is a thin membrane called the ear drum or tympanic membrane. When compression of medium produced due to vibration of the object reaches the ear drum, the pressure on the outside of the membrane increases and forces the ear drum inwards.

Middle ear: The middle ear is the cavity with three important ear bones. The moddle ear transmits the amplified pressure variations recieved from the sound wave to the inner ear.

Inner ear:  In the inner ear, the pressure variations are turned into electrical signals by the chochlea. These electrical signals are than sent to the brain via the auditory nerve, and the barin interprets them as sound. 

                                               

Sample Questions
(More Questions for each concept available in Login)
Question : 1

Which of the following are correct :

(a) Auditory canal is a part of middle ear.

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

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

Right Option : C
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Question : 2

Identify the characteristic of a sound _________________

Right Option : D
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Question : 3

For human ears, the audible range is ____________Hz to _______________Hz.

Right Option : C
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