Ultrasounds are employed to detect cracks and flaws in metal blocks because they have shorter wavelengths, enabling them to interact with small defects. Longer wavelength sounds bend around corners, entering the detector without effectively detecting the flaws.
How are ultrasounds utilized in detecting cracks and flaws in metal blocks, and why are longer wavelength sounds unsuitable for this purpose?
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Ultrasounds are used to detect cracks and flaws in metal blocks by emitting high-frequency sound waves into the material. When encountering a flaw, the sound waves reflect back, revealing its location and size. Longer wavelength sounds are unsuitable for this purpose because they have lower resolution and cannot effectively penetrate dense materials, making them less capable of detecting small cracks and flaws accurately.