Q. Whenever there is a change in the medium, then the Ultrasonic waves will be _

A
Echoed
B
Reflected
C
Detected
D
None of these
Solution:

Whenever there is a change in the medium, then the Ultrasonic waves will be reflected. This is the principle used in Ultrasonic flaw detector. Thus, from the intensity of the reflected echoes, the flaws are detected without destroying the material and hence this method is known as a Non Destructive method.

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