GCSE Physics - Ultrasound #74

The video explains ultrasound, sound waves with frequencies above 20,000 Hertz, and its applications. Ultrasound is naturally produced by animals like bats for echolocation, while humans use electrical devices to generate it. The video covers how ultrasound waves interact with different mediums, reflecting and refracting at boundaries, which is used in medical imaging, industrial quality checks, and sonar. In prenatal scanning, ultrasound helps visualize fetuses, while in industry, it detects faults in products. Sonar uses ultrasound to measure distances underwater, such as from submarines to the sea floor.

Discuss the safety of using ultrasound in medical applications.

What is echo sounding and how is it applied in submarines?

How can the distance to the sea floor be calculated using ultrasound?