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2014-03-29T22:27:49+05:30

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An normal being can listen voice of frequecny of @0Hz to 20,000Hz so frequency below 20 is infrasonic and above 20,000 is ultra sonic
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Khusbhu I by mistake insted of 2 wrote @ please see it
2014-03-30T08:34:04+05:30

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20tò20000 is the range of the frequency
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