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Ultrasonic Sound

when there is...

Question

when there is a crack in a metal block and if we pass ultrasound waves through it, the waves get reflected. why?

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Solution

$w h e n a n u n t r a s o n i c w a v e i s p a s \sin g t h r o u g h t h e c r a c k o f t h e m e t a l, i t g e t s r e f l e c t e d b e c a u s e t h e c r a k s o f h o l e s i n s i d e t h e m e t a l b l o c k s w h i c h a r e i n v i s i b l e f r o m o u t s i d e r e d u c e s t h e s t r e n g t h o f t h e s t r u c t u r e . i f t h e i r i s d e f e c t t h e n t h e u l t r a s o n i c w a v e g e t s r e f l e c t b a c k .$

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