Compared to audible sound waves in the same medium, ultrasonic waves have?

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1. Compared to audible sound waves in the same medium, ultrasonic waves have?

A higher speed of travel

A higher frequency, but the same speed

A lower frequency

A much longer wavelength

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Ultrasonic waves simply have a higher frequency than audible sound. In a given medium, their speed is the same as any other sound wave, since speed depends on the medium, not frequency.