Mini-Course: Preparing for School-Entry


1 - How Hearing Works


In high-amplitude waves, the vibrations vary greatly and are experienced as loud sounds. Sound amplitude is commonly measured in decibels. The higher the amplitude/decibel, the louder the sound.
  • At a close distance, human speech usually falls between 30 and 50 decibels.
  • The softest sound detectable by the human ear registers at 0 decibels.
  • A rock concert or helicopter can be as loud as 115-120 decibels.

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