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Ultrasound refers to sound waves with frequencies higher than the audible range of human hearing, which is typically 20 Hz to 20 kHz. Any sound wave with a frequency above 20 kHz is considered an ultrasound wave.
Frequency Range: Greater than 20 kHz; medical and industrial applications often use frequencies from 1 MHz to 15 MHz.
Wavelength: Ultrasound has shorter wavelengths compared to audible sound, allowing it to resolve fine details in imaging and detection.
Inaudibility: Humans cannot hear ultrasound, making it safe for diagnostic purposes.
Medical Imaging: Used in ultrasound scans to view internal organs, monitor pregnancy, and detect abnormalities.
Industrial Testing: Detects cracks and defects in metals, pipelines, and structures.
Cleaning: High-frequency vibrations remove dirt in ultrasonic cleaners.
Navigation & Detection: Bats and dolphins use ultrasound for echolocation.
Above 20,000 kHz: Far beyond typical ultrasound; this is in the extremely high-frequency range.
Below 20 kHz: This is audible sound, not ultrasound.
Below 02 kHz: Very low-frequency sound, unrelated to ultrasound.
Ultrasound frequency = above 20 kHz
Inaudible to humans
Applications: medical imaging, industrial testing, cleaning, echolocation
Wavelengths are shorter than audible sound, allowing precise detection
👉 Correct Answer: Option 1 – Above 20 kHz
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