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Worksheet - 15, , WB Wwe — me, , a, , 10., , VIII Std, , Science, Sound, Tick true/False against the following statements., , Unwanted or unpleasant sound is termed as music., , For human ears, the audible range is 20Hz to 20,000Hz., Sound cannot travel in vacuum., , The lower the frequency of vibration higher is the pitch., , The number of oscillations per second of a vibrating object is, called its time period., , Noise pollution may cause partial hearing impairment., , If the amplitude of vibration is large, sound is feeble., , Time taken by an object to complete one oscillation is called, , period., The unit of frequency is hertz., Shrillness of a sound is determined by the frequency of, , vibration., , Note : Write neatly in your homework book.