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Q1
Figure 1 shows ultrasound being used to detect a hidden crack in a solid aluminium object. The transmitted and reflected pulses of ultrasound are shown on the screen.
(c) Ultrasound travels at 6300 m/s in aluminium.
Determine the depth of the crack below the top surface of the aluminium.
Use information from Figure 1.
Give your answer to two significant figures.
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Depth = ____________________________ m (4)
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Time = 8 μs = 8×10^−6
Distance= 1/2×6300×8×10 ^−6
Distance=0.0252m
therefore, Distance= 0.025 m

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