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2016-03-21T14:56:13+05:30

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Hz is the unit of sound [in which sound is expressed]
so 300Hz means an object has an 300 frequency of sound or sound of the object is 300hz
full form of Hz is hertz 
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mark as brainlies , if helpful plzzzz
2016-03-21T15:15:41+05:30

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Hz is the abbreviation or symbol for the Hertz, the SI unit of frequency. It was named after Heinrich Hertz, who is known for his works in electromagnetic radiation.

300 Hz means that the a osillation/rotation/wave repeats or completes 300 cycle per second. 
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