Question

Ultrasound is sound waves with frequencies higher than the upper audible limit of human hearing. Ultrasound is not different from "normal" (audible) sound in its physical properties, except that humans cannot hear it. This limit varies from person to person and is approximately 20 kilohertz (20,000 hertz) in healthy young adults. Ultrasound devices operate with frequencies from 20 kHz up to several gigahertz.Ultrasound is used in many different fields. Ultrasonic devices are used to detect objects and measure distances. Ultrasound imaging or sonography is often used in medicine. In the nondestructive testing of products and structures, ultrasound is used to detect invisible flaws. Industrially, ultrasound is used for cleaning, mixing, and accelerating chemical processes. Animals such as bats and porpoises use ultrasound for locating prey and obstacles.An ultrasound is used to find a tumor by showing the tumor's exact location in the body.
Answer the following based on above paragraph....

1. The penetrating powers of ultrasonic sound and other audible sounds are given as f1 and f2 respectively. Then *
2 points
f1 = f2
f1 > f2
f1 < f2
f1 = 2f​

Answer 1

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