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- If a Schottky defect concentration of 6.2 x 1010 /cm3 is observed in Al2O3, what is the total vacancy concentration (in 1/cm3) present in this sample of Al2O3? a. 2.3 x 108b. 3.1 x 1010c. 6.2 x 1010d. 1.24 x 1011e. 3.1 x 1011 When compared to that of a covalent material, the short-range atomic structure of amaterial assembled using ionic bonding can be characterized as having a:a) higher coordination numberb) lower atomic packing factorc) higher atomic packing factord) lower coordinationnumbere) a and c onlyA specimen of a 4340 steel alloy having a plane strain fracture toughness of 45 MPa sqrt(m) (41 ksi sqrt(in)) is exposed to a stress of 1000 MPa (145,000 psi). Will this specimen experience fracture if it is known that the largest surface crack is 0.75 mm (0.03 in.) long? Why or why not? Assume that the parameter Y has a value of 1.0.Investigate and explain two experimental methods to measure the molecular ` weight distribution of polymers.
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- 5. Explain the determination of molecular weight of polymer samples usingdilute viscosity measurement.Using this table for the standard durve of cobalt (II) solution in UV Vis Molarity (M) Absorbance 0.025 0.056 0.05 0.131 0.075 0.221 0.1 0.311 0.125 0.399 0.15 0.492 0.175 0.592 Determine the (3 sig figs) A. R squared value of the curve B. value of the molar absorptivity constant if the path length is 10 cm? C. Unknown concentration if it showed an absorbance value of 0.320?Q. Determination of hardness by Clark's method.
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