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Speed Sound Bone 3500-4000 m/s — FRCA Primary MCQ

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EasyPhysics & Clinical MeasurementSpeed Sound Bone 3500-4000 m/sFRCA Primary

The speed of sound in bone is approximately:

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Correct answer: D — 3500-4000 m/s

Sound travels faster through denser media: air ~340 m/s / fat ~1450 m/s / soft tissue ~1540 m/s / bone ~3500-4000 m/s. Bone creates a bright hyperechoic reflection with posterior acoustic shadowing on ultrasound because of the large impedance mismatch between soft tissue and bone.

Reference: Al-Shaikh Stacey 2019 Essentials of Anaesthetic Equipment