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.

Question

Quizplus · Accepted Answer

The time it takes for an ultrasonic signal to travel to a boundary and back is calculated using the formula $ \text{Time} = \frac{2 \times \text{Distance}}{\text{Speed}} $. Here, the distance is 2.5 cm (0.025 m), and the speed of sound in soft tissue is 1450 m/s. Thus, the time is $ \frac{2 \times 0.025 m}{1450 m/s} = \frac{0.05}{1450} s = 34.5 \times 10^{-6} s = 34.5 \mu s $.

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