In an ultrasonic pulse echo technique, the ultrasonic pulse travels with velocity 5.941 km/s in a steel bar of thickness 22 mm. Then, the echo time of the ultrasonic pulse is nearly:

In an ultrasonic pulse echo technique, the ultrasonic pulse travels wi

1.	In an ultrasonic pulse echo technique, the ultrasonic pulse travels with velocity 5.941 km/s in a steel bar of thickness 22 mm. Then, the echo time of the ultrasonic pulse is nearly:
A.	5.4 μs
B.	6.4 μs
C.	7.4 μs
D.	8.4 μs
Answer» D. 8.4 μs