Ultrasound frequencies are defined as those greater than 20,000 Hz.

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Multiple Choice

Ultrasound frequencies are defined as those greater than 20,000 Hz.

Explanation:
Ultrasound describes sound waves that are beyond what humans can hear. The human hearing range goes up to about 20 kHz, so any frequency greater than 20,000 Hz is considered ultrasound. This definition is a property of the wave’s frequency, not the medium it travels through, so it doesn’t depend on water or any other material. In practice, medical imaging uses frequencies in the MHz range to get good resolution and sufficient depth, but the label remains tied to being above the audible threshold. So, the statement is true.

Ultrasound describes sound waves that are beyond what humans can hear. The human hearing range goes up to about 20 kHz, so any frequency greater than 20,000 Hz is considered ultrasound. This definition is a property of the wave’s frequency, not the medium it travels through, so it doesn’t depend on water or any other material. In practice, medical imaging uses frequencies in the MHz range to get good resolution and sufficient depth, but the label remains tied to being above the audible threshold. So, the statement is true.

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