On which of the following is the working principle of concrete hammer for non-destructive test based ?

On which of the following is the working principle of concrete hammer

1.	On which of the following is the working principle of concrete hammer for non-destructive test based ?
A.	Rebound deflections
B.	Radioactive waves
C.	Ultrasonic pulse
D.	Creep-recovery
Answer» B. Radioactive waves

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On which of the following is the working principle of concrete hammer for non-destructive test based ?

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