Question

explain how defects in a metal block can be detected using ultrasound

Answer 1

Heya,

Ultrasonic waves are allowed to pass through the metallic block and detectors are used to detect the transmitted waves. If there is even a small defect, the ultrasound gets reflected back indicating the presence of the flaw or defect.

HOPE IT HELPS:-))

Answer 2

if the rays pass straight then there is no defrct but if they are reflected back or bend at any point then there is defect