O-LevelPhysicsWaves5054/11 · May/June 2025 · Q271 Mark
A pulse of ultrasound from a sensor is reflected back to the sensor by a crack in a piece of metal and by the bottom surface of the metal. [Ultrasound reflection diagram] The reflection from the crack is received back at the sensor 1.0 × 10⁻⁵ s after the pulse is sent out. The reflection from the bottom surface is received back at the sensor 1.5 × 10⁻⁵ s after the pulse is sent out. The speed of ultrasound in the metal is 5200 m/s. What is the distance x between the crack and the bottom surface of the metal?
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
A0.013 m
B0.026 m
C0.052 m
D0.078 m
✓ Correct answer
A: 0.013 m
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