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 MHz ultrasound is directed through a layer of tissue with a bone 0.55 cm below the surface. Will standing waves be created?
Moselq8
Answered question
2022-08-11
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 MHz ultrasound is directed through a layer of tissue with a bone 0.55 cm below the surface.
Will standing waves be created?
Answer & Explanation
wijnvatid
Beginner2022-08-12Added 16 answers
...(1)
where m is an integer, v is the speed of sound through the given medium and Lis the length of the tube.
Given The length of the layer of the tissue is L = 0.55cm. The drequency of the wave is f=0.7MHz. The speed of sound through human tissue is .
Calculatlon By using Eq. (1) and the given numerical values, we can find the value for the parameter m. If the value happens to
be an integer, a standing wave will be created. We find
=5
We conclude that standing waves will be created.
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