A conceptual question on sound!?

Question

My question is what happens to the quality of sound when its frequency is increased. Audible range is between 20Hz-20000Hz. But why 21000Hz is not audible.

Answer 1

Velocity of sound in air is relatively constant.
And formula for the wavelength of sound is, lambda=v/f
Whence, lambda, v, and f stand for wavelength, velocity of sound in air and frequency respectively.
here frequency is written in Hz
In view of the equation, as the frequency increases wave length decreases. Hence become short waves.
OK, tymphanium membrane is a thin and delicate tissue. To cause vibration in the tissue wave should not be too long or short insted it should be within the specified range.
When the wave becomes too short it passes through the membrane insted of causing vibration.
This is the cause for inaudibility of sound.

Answer 2

The human ear has evolved to be most responsive to sounds in the range you cite, although it is much better in the middle portion of that range than the upper or lower limits, on average. Dogs, as you probably know, are more sensitive to sounds of higher frequencies (above 20000 Hz), which is why you can drive them crazy with dog whistles that they can hear but you cannot. The reason for the differences stem from the anatomy of the ear, and the eardrum and fine bones that vibrate as sound waves pass over them. Human ears just aren't that sensitive to the higher frequency sound waves. As the frequency increases, the pitch of the sound is also increasing (ie, if it were a musical note, the tone would be getting higher and higher). So if you could hear sounds in the higher frequency range, they wouldn't sound qualitatively any different, just higher in tone.
Curiously, teenagers and young people have a better sensitivity to high frequency sound than adults and older people. This has been used to make "teenage repellents" and also ring tones that kids can hear but adults largely do not. See link below

Answer 3

if you're talking about sample rate, i've tried doing that with several of my MP3s, but i cannot seem to access the 21000Hz range. the only given range close to 21000Hz is 22050Hz which is still audible. 8000Hz is the lowest among the given formats and is considered as "Telephone Quality". 44100Hz is considered CD quality.

if you're talking about pitch frequency, i can only seem to increase it up to 4500Hz above current frequency.

Answer 4

2. Visualising a vibrating string between the lip of the bottle and the liquid floor, using fact the liquid decreases (measuring from the backside of the bottle incredibly than the lip - an assumption of uncomplicated experience, yet no longer of extra precis information), the capacity passing alongside the string would be conserved, ie. the frequency-amplitude-speed relationships, that one will see returned in optics, stay consistent. One sees the amplitude shrink, and the frequency shrink, while a vibrating string is pulled tighter (the liquid decreases). One hears a decrease tone. a million. They pay me to sing interior the bathe. additionally, the air molecules suffused with water vapour stumble upon one yet another otherwise: there's a resonant fog surrounding me. And my voice container is the two softened - fewer harsh tones alongside crusty edges (I smoke cigarettes and drink a gallon of rotgut whiskey according to day), and the very air interior of pronounced (making a song) voice container is likewise humid. They pay me to no longer sing while i'm no longer interior the bathe - yet in basic terms 0.5 as a lot. in addition they pay me to no longer do physics anymore - the comparable quantity they pay me to place in writing poetry!

Answer 5

this is not a general range and differ from man to man and it depends on ear structure.
do you know that whales and dogs can hear sounds which we can not?

increasing sound frequency do not affect its quality only our ear is no longer capable of responding it.

Answer 6

There is a limit to the speed your eardrum can vibrate above this limit sounds are inaudible!