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What property of sound waves acts like the principle of ultrasound?

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in Clinical Science by (102k points)
What property of sound waves acts like the principle of ultrasound?

(a) Reflection and Refraction

(b) Reflection only

(c) Refraction only

(d) Propagation

I have been asked this question in an interview.

The origin of the question is Ultrasound in portion Diagnostic Investigation via Imaging Techniques of Clinical Science

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Right choice is (a) Reflection and Refraction

For explanation: The ultrasound works on the principle of reflection and refraction. While it is necessary that sound waves need a medium to travel, so we can say propagation is important but it is only because the sound wave gets refracted when the medium changes and are reflected back that the image is formed. Thus, the principle for ultrasound is reflection and refraction.

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