An engineer is using an ultrasonic transducer to measure the thickness d d\,d of a titanium alloy component during a non-destructive testing (NDT) inspection.
The diagram shows the setup and the corresponding oscilloscope signal trace.
The speed of the ultrasound waves in this titanium alloy is 6.2 km s-1.
The returned echo from the bottom boundary is detected 1.5 × 10-5 s after transmission.
What is the thickness d d\,d of the component?
4.65×10−5 m4.65 \times 10^{-5}\text{ m}4.65×10−5 m
0.0465 m0.0465\text{ m}0.0465 m
0.0930 m0.0930\text{ m}0.0930 m
0.186 m0.186\text{ m}0.186 m