1.

Surface energy of crack is given by __________

A. 4ϒ<sub>s</sub>a
B. 2ϒ<sub>s</sub>(a)<sup> 1/2</sup>
C. 2ϒ<sub>s</sub>E
D. 2ϒ<sub>s</sub>a
Answer» B. 2‚âà√¨‚àö‚â†<sub>s</sub>(a)<sup> 1/2</sup>


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