What are ultrasonic waves?
Asked by Sarika agarwal on 10 January 2010 3:46:15 PM   
   
   
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  1. On 9 September 2010 3:57:57 AM priyanka chaudhary answered :

    A sound wave that has a frequency above about 20,000 hertz.
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  2. On 20 January 2011 12:11:57 AM CHATURBHUJ PODDAR answered :

    Sound waves of frequency higher than the upper limit of human audibility i.e. 20,000 hertz are called ultrasonics.
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