i) श्राव्यातीत ध्वनीची वारंवारिता ----------------------------------- असते. अ) 20 Hz ते 2000 Hz ii) 20 Hz पेक्षा कमी iii) 200 पेक्षा कमी iv) 20000 पेक्षा जास्त
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iv) 20000 hz
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