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Mechanical waves having a frequency above the audible range are called
Mechanical waves having a frequency above the audible range are called
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The correct option is B Ultrasonics
Ultrasound is an oscillating sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from 'normal' (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 KHz (20,000 hertz) in healthy, young adults.
Ultrasound is an oscillating sound pressure wave with a frequency greater than the upper limit of the human hearing range. Ultrasound is thus not separated from 'normal' (audible) sound based on differences in physical properties, only the fact that humans cannot hear it. Although this limit varies from person to person, it is approximately 20 KHz (20,000 hertz) in healthy, young adults.
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