How long is the round-trip travel time to a reflector 20 cm deep in tissue?

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Multiple Choice

How long is the round-trip travel time to a reflector 20 cm deep in tissue?

Explanation:
Sound travels in tissue at about 1540 m/s. For a round trip, the travel time is t = 2d/v. With depth d = 0.20 m, t = 2 × 0.20 / 1540 ≈ 0.000260 s, which is 260 microseconds. The one-way time would be about 130 microseconds, so the round-trip value is twice that.

Sound travels in tissue at about 1540 m/s. For a round trip, the travel time is t = 2d/v. With depth d = 0.20 m, t = 2 × 0.20 / 1540 ≈ 0.000260 s, which is 260 microseconds. The one-way time would be about 130 microseconds, so the round-trip value is twice that.

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