Answer:
The
flaws like internal cracks, etc., in the metal blocks are detected by using ultrasound.
This is based on the fact that the internal crack (or hole) in the block
does not allow ultrasonic wave to pass through it. To detect the flaw in
metallic block, a source of ultrasonic is placed in front of one face of block
and a detector on the opposite face.
The ultrasonic waves are produced and made to pass through
one face of block and detected on the opposite face.
(a) If the ultrasonic waves passes uninterrupted through
all parts of metal block, then there is no defect in block.
(b) If the ultrasonic waves do not reach the opposite
face, then the block has defect (like a crack or a hole).
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