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2015-10-30T19:32:49+05:30

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Hertz is the si unit of frequency and noise is measured in decibels
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2015-10-30T19:35:33+05:30

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Decibel is a unit for expressing the ratio between two amounts of electric or acoustic power or for measuring the relative loudness of sounds whereas Hertz is a unit used to measure frequency of sound.
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