. When sound enters it, it travels down a canal at the end of which there is a thin stretched membrane. It is called the eardrum. It performs animportant function. To understand what the eardrum does, let us build a tin-can model of the eardrum.
The phenomenon of sound depends on the amplitude of the sound wave. · It is directly proportional to the square of the amplitude of vibration. Loudness =( Amplitude )2
The vocal cords in men are about 20 mm long. In women these are about 15mm long. Children have very short vocal cords. This is the reason whythe voices of men, women and children are different.
In humans, the sound is produced by the voice box or the larynx
The to and fro or back and forth motion of an object is called vibration.
Sound is produced by vibrating objects. i) In human beings, the vibration of the vocal cords produces sound.ii) Sound travels through a medium (gas, liquid or solid). It cannot travel in vacuum.
