An Si-O bond with a Young‚Äö√Ñ√∂‚àö√ë‚àö¬•s m – McqOptions

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1.	An Si-O bond with a Young‚Äö√Ñ√∂‚àö√ë‚àö¬•s modulus of 9*10¹⁰Nm^-1 have an elliptical crack of depth 7nm. The surface energy is 2.29 J. Estimate fracture stress for silica fiber.$
A.	4.32*10<sup>9</sup>Nm<sup>-1</sup>
B.	6.32*10<sup>9</sup>Nm<sup>-1</sup>
C.	5.2*10<sup>9</sup>Nm<sup>-1</sup>
D.	3*10<sup>9</sup>Nm<sup>-1</sup>
Answer» B. 6.32*10<sup>9</sup>Nm<sup>-1</sup>

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