Physics for IGCSE & O level - Waves And Sounds (Section 7 - No. 30)
Why is the echo-sounding principle used to detect flaws in metals?
To measure the thickness of the metal
To identify tiny gaps in the metal
To determine the density of the metal
To assess the metal's resistance to heat
คำอธิบาย
The echo-sounding principle can be used to detect flaws (tiny gaps) in metals.