The frequency determines the shrillness or pitch of a sound. If the frequency of vibration is higher we say that the sound is shrill and has a higherpitch. If the frequency of vibration is lower, we say that the sound has a lower pitch.
Loudness of sound is proportional to the square of the amplitude of the vibration producing the sound. For example, if the amplitude becomes twice, the loudness increases by a factor of 4. The loudness is expressed in a unit called decibel (dB). The following table gives some idea of theloudness of sound coming from various …
The to and fro motion of an object is known as vibration. This motion is also called oscillatory motion.
It is the height of crest or depth of trough from the mean position of the wave. S I unit of amplitude is meter ( m) . C G S unit of amplitude is cm
The number of oscillations per second is called the frequency of oscillation. Frequency is expressed in hertz. Its symbol is Hz. A frequency of 1 Hz is one oscillation per second.
. 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.
