Why can't all words be heard ?

Why can't all words be heard ?
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1 Answer

Answer :

The vibration of the source produces sound. Not all vibrations can arouse the feeling of hearing in our ears. It has been observed that if the frequency of the source is less than 20 and more than 20,000 , then that vibration cannot create the feeling of hearing in our ears. As a result, we do not hear that sound. We can only hear that sound if the frequency of the source is between 20,000 and 20,000 . But in the case of other animals this limit is different. So what we don't hear, other animals can hear. For example, dogs.
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