When a reflector is 3 cm deep, a pulses time-of-flight is _____.

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Sharpen your skills for the Davies Publishing SPI Test with targeted flashcards and multiple-choice questions, complete with hints and clarifications. Prepare thoroughly for success!

Multiple Choice

When a reflector is 3 cm deep, a pulses time-of-flight is _____.

Explanation:
Time-of-flight is the round-trip travel time of the pulse—from the transducer to the reflector and back. So it uses twice the depth divided by the speed of sound in tissue. Depth is 3 cm, which is 0.03 m. Round-trip distance is 0.06 m. Using the typical speed of sound in soft tissue, about 1540 m/s, the time is 0.06 / 1540 ≈ 3.9 × 10^-5 seconds, which is 39 microseconds. So the pulse takes roughly 39 µs to travel to the reflector and return. (One-way time would be about 19.5 µs, but time-of-flight is the round-trip.)

Time-of-flight is the round-trip travel time of the pulse—from the transducer to the reflector and back. So it uses twice the depth divided by the speed of sound in tissue.

Depth is 3 cm, which is 0.03 m. Round-trip distance is 0.06 m. Using the typical speed of sound in soft tissue, about 1540 m/s, the time is 0.06 / 1540 ≈ 3.9 × 10^-5 seconds, which is 39 microseconds.

So the pulse takes roughly 39 µs to travel to the reflector and return. (One-way time would be about 19.5 µs, but time-of-flight is the round-trip.)

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