How Long Does It Take from Emitting an Ultrasonic Signal

question 18

Multiple Choice

How long does it take from emitting an ultrasonic signal until its return as an echo from a flat interface between a soft tissue and a muscle, if the thickness of a soft tissue is 2.5 cm? Assume that the speed of sound in soft tissue is 1450 m/s.

• A)17.2 ìs
• B)34.5 ìs
• C)1.72 ms
• D)3.45 ms

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Definitions:

Observational Evidence

Information and data gathered through observing phenomena without manipulating variables, often used in studies where controlled experiments are not feasible.

Critical Thinking

The process of actively and skillfully conceptualizing, applying, analyzing, synthesizing, and evaluating information to reach an answer or conclusion.

Cause-Effect Conclusion

Logical determination that specifies how one event (the cause) directly leads to another event (the effect).

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A philosophical attitude of doubting the veracity of knowledge claims in the absence of compelling evidence.