Question
Ultrasound waves are often used to produce images of objects inside the body. Why are ultrasound waves effective for this purpose?
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This property is often referred to as "ultra" in the term ultrasound. Show more…
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Why do ultrasound waves produce images of objects inside the body more effectively than audible sound waves do?
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In addition to producing images, ultrasound can be used to heat tissues of the body for therapeutic purposes. An emitter is placed against the surface of the skin; the amplitude of the ultrasound wave at this point is quite large. When a sound wave hits the boundary between soft tissue and bone, most of the energy is reflected. The boundary acts like the closed end of a tube, which can lead to standing waves. Suppose $0.70 \mathrm{MHz}$ ultrasound is directed through a layer of tissue with a bone $0.55 \mathrm{cm}$ below the surface. Will standing waves be created? Explain.
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