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Which statement among the following is not true?

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Ultrasonic waves are used in echocardiography.

Ultrasound is used to clean parts located in hard-to-reach places.

Ultrasounds can be used to detect cracks and flaws in metal blocks.

Ultrasound is used in monitoring earthquakes and volcanoes.

answer is D.

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Detailed Solution

The wrong statement is "Ultrasound is used in monitoring earthquakes and volcanoes."

Actually, Infrasound which is below 20 Hz frequency is used in the monitoring of earthquakes and volcanoes. Earthquakes produce low-frequency infrasound before the main shock waves begin which possibly alert the animals

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