Why ultrasonic waves does not harm …
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Meghna Thapar 5 years, 2 months ago
One of the most well known effects of ultrasound is that as Ultrasound waves pass through a tissue they tend to heat it up. ... Although Ultrasound cannot be heard by humans, at high decibels it can still cause direct damage to human ears. Ultrasound in excess of 120 decibels may cause Hearing damage. Ultrasound is nothing but sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is no different from 'normal' (audible) sound in its physical properties, except in that humans cannot hear it. ... Hence, Ultrasound which has a range of above 20 kHz (20,000 Hz) can't be heard.
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