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← ScienceWhich outcome occurs when sudden cooling shocks tempered glass?
A)Extensive surface crack propagation occurs✓
B)Uniform compressive stress becomes tensile
C)Crystalline transformation prevents breakage
D)Increased infrared transmission within material
💡 Explanation
Rapid cooling causes differential thermal contraction, inducing surface stresses; this initiates crack propagation due to Griffith's crack theory, because tensile stresses overcome the material strength; therefore, it cracks rather than remaining intact which would need surface compression.
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