LEND ME YOUR EAR, I WILL TELLYOUR AGE

If a bell is stroked in a place of worship, it vibrates; set the air molecules in vibration; molecules strike eardrum and vibrates it; our brain interprets the vibrations and we perceive the sound. We understand that the vibrations are the basis for the sound. Number of vibrations taking place in one second is called "frequency". Suppose there are 100 vibrations per second, we say, the frequency is 100 hertz or 100 Hz.

    The human ears are extremely sensitive to the frequency range 2000 hz -5000 hz.  All humans at any age can hear up to 8000 hz clearly.  Persons of age over 50, cannot hear 12000 hz.
Over 40 - can hear up to 15000hz
over 30- up to 16000hz
above 17 khz, even young persons under 25 age, struggle to hear that frequency.  Only newborn may hear them.
    Why does our hearing appear to 'age'.  Our ears have distinctive, spiral-shaped part called the cochlea and it is filled with fluids and tiny hairs called cilia.  These cilia are vibrated by air molecules (sound waves) and we sense the sound.  The most sensitive cilia get destroyed as we age.
    The cilia do not regrow.  Loud music from headphones is harmful. So, do not raise the volume beyond allowed level.
     Many animals can hear higher frequencies.

Dog- 64hz -44khz
Mouse- 900hz-79khz
cat-55hz -77khz
dolphin -150hz –150khz

    We, humans can hear up to 8 k hz comfortably, but dolphin can hear up to 150khz.
    The sound waves which have frequencies more than 20 khz (that we cannot hear) is called ultrasonic waves.  Many medical instruments use ultrasonic waves for scanning purpose.

NOTE: 1. When you go near an electrical transformer, you hear a humming sound. The frequency of electric current is 50 hz and that is also the frequency of humming noise.
Note 2. All objects like wine glass, bell, table, plate, wall etc. have their own natural frequency.
Note 3. As we age, our vision, hearing, taste, muscle strength may get eroded. Our teeth, hair may fall, but our determination, thoughts, mind, enthusiasm should remain young and strong as ever.

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