Question
Ultrasonic pulse echo technique, a non-destructive
ultrasonic testing, is employed for any possible flaw detection in a metallic bar of thickness 30 cm. If the arrival times of the ultrasonic pulses are 45 us and 90 us respectively, the distance of the flaw from one end of the steel bar at which the ultrasonic pulse initially enters the steel bar, will be:Solution
The correct answer is B
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