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Sound and Hearing, image, image, image, image, image, image, image, image,…

- - - - natural
      - man-made
    - - outer ear
        
        1.pinna
        
        get sound wave
        
        2.ear canal
        
        road that sound travel
        
        3.eardrum
        
        get vibrate
      - middle ear
        
        incus
        
        get vibration from eardrum to inner ear
        
        3.stapes
        
        1.malleus
      - inner ear
        
        1.cochlea
        
        get vibration from middle ear to brain by nerve
- - - - Sound is the quickly varying pressure wave travelling through a medium. When sound travels through air, the atmospheric pressure varies periodically. The number of pressure variations per second is called the frequency of sound, and is measured in Hertz (Hz) which is defined as cycles per second.
    - - refers to how loud or soft a sound seems to a listener. The loudness of sound is determined, in turn, by the intensity of the sound waves. Intensity is a measure of the amount of energy in sound waves. The unit of intensity is the decibel (dB)