omron-sinicx/MaterialBENCH huggingface dataset:
Question: A relatively large plate of a glass is subjected to a tensile stress of 40 MPa. If the specific surface energy and modulus of elasticity for this glass are 0.3 J/m2 and 69 GPa, respectively, determine the maximum length of a surface flaw (μm) that is possible without fracture. Choose the answer from the following four choices: (a) 46, (b) 0.33, (c) 4.1, and (d) 8.2.
Answer: (d)
Question: What is the magnitude of the maximum stress (MPa) that exists at the tip of an internal crack having a radius of curvature of 2.5 x 10^-4 mm and a crack length of 2.5 x 10^-2 mm when a tensile stress of 170 MPa is applied? Choose the answer from the following four choices: (a) 2404, (b) 1202, (c) 1700, and (d) 4808.
Answer: (a)
Question: If the specific surface energy for soda-lime glass is 0.30 J/m2, using data: Flexural Strength = 69 MPa; Modulus of Elasticity = 69 GPa, calculate the critical stress (MPa) required for the propagation of a surface crack of length 0.05 mm. Choose the answer from the following four choices: (a) 16.2, (b) 23, (c) 32.5, and (d) 45.9.
Answer: (a)
Question: A structural component in the form of a wide plate is to be fabricated from a steel alloy that has a plane strain fracture toughness of 77.0 MPa√m and a yield strength of 1400 MPa.The flaw size resolution limit of the flaw detection apparatus is 4.0 mm. If the design stress is one-half of the yield strength and the value of Y (a dimentionless parameter that depends on both crack and specimen sizes and geometries to express fracture toughness) is 1.0, determine whether a critical flaw for this plate is subject to detection by reasoning with the flaw size. Choose the answer from the following four choices: (a) Is subject to detection because flaw size < 4.0 mm, (b) Is not subject to detection because flaw size < 4.0 mm, (c) Is subject to detection because flaw size > 4.0 mm, and (d) Is not subject to detection because flaw size > 4.0 mm.

Answer: (b)
Question: Following is tabulated data that were gathered from a series of Charpy impact tests on a ductile cast iron.
Temperature (℃) Impact Energy (J )
 25 124
 50 123
 75 115
 85 100
 100 73
 110 52
 125 26
 150 9
 175 6
Determine a ductile-to-brittle transition temperature (℃) as that temperature corresponding to the average of the maximum and minimum impact energies. Choose the answer from the following four choices: (a) 95, (b) 105, (c) 100, and (d) 85.

Answer: (b)
Question: The fatigue data for a brass alloy are given as follows:
Stress Amplitude(MPa) Cycles to Failure
310  2x10^5
223  1x10^6
191  3x10^6
168  1x10^7
153  3x10^7
143  1x10^8
134  3x10^8
127  1x10^9
Calculate the fatigue strength (MPa) at 5 x 10^5 cycles.
Choose the answer from the following four choices: (a) 177, (b) 185, (c) 250, and (d) 277.

Answer: (c)
Question: The following creep data were taken on an aluminum alloy at 400 C and a constant stress of 25 MPa. Determine the steady-state or minimum creep rate (min^-1). Choose the answer from the following four choices: (a) 1.3 x 10^-2, (b) 8.6 x 10^-3, (c) 7.0 x 10^-3, and (d) 8.7 x 10^-3. Note: The initial and instantaneous strain is not included.
Time (min) Strain
0 0.000 
2 0.025 
4 0.043 
6 0.065 
8 0.078 
10 0.092 
12 0.109 
14 0.120
16 0.135
18 0.153
20 0.172
22 0.193
24 0.218
26 0.255
28 0.307

Answer: (c)
Question: Steady-state creep data taken for a stainless steel at a stress level of 70 MPa are given as follows:
έ(s^-1)  T(K)
1.0x10^-5  977
2.5x10^-3  1089
If it is known that the value of the stress exponent n for this alloy is 7.0, calculate the steady-state creep rate (s^-1) at 1250 K and a stress level of 50 MPa. Choose the answer from the following four choices: (a) 1.2, (b) 0.12, (c) 13, and (d) 0.0049.

Answer: (b)
Question: When steels are classified in to four, choose one which is not included in the classifications. Choose the answer from the following four choices: (a) cast irons, (b) stainless, (c) low-carbon, and (d) high-carbon.
Answer: (a)
Question: Whichi alloying element is not used to enhance hardness and wear resistance in tool steels? Choose the answer from the following four choices: (a) Mo, (b) Cr, (c) V, and (d) Cu.
Answer: (d)
Question: Calculate the minimum cation-to-anion radius ratio for the coordination number 3. Choose the answer from the following four choices: (a) 0.732, (b) 0.414, (c) 0.225, and (d) 0.155.
Answer: (d)
Question: The ionic radii of Fe2+ and O2- are 0.077 nm and 0.140 nm, respectively. What crystal structure would you predict for FeO? Choose the answer from the following four choices: (a) rock salt, (b) Cesium chloride, (c) Zinc blende, and (d) Spinel.
Answer: (a)
Question: Based on the crystal structure of sodium chloride and the ionic radii for Na+ and Cl- as 0.102 and 0.181 nm, respectively, calculate the theoretical density (g/cm^3) of this material. Choose the answer from the following four choices: (a) 1.39, (b) 4.28, (c) 2.14, and (d) 2.78.
Answer: (c)
Question: Calculate the number of Schottky defects per cubic meter in potassium chloride at 500 ℃. The energy required to form each Schottky defect is 2.6 eV, whereas the density for KCl (at 500 ℃) is 1.955 g/cm3. Choose the answer from the following four choices: (a) 87, (b) 1.63 x 10^11, (c) 1.17 x 10^15, and (d) 5.31 x 10^19.
Answer: (d)
Question: If electroneutrality is to be preserved, which point defects are possible in NaCl when a Ca2+ substitutes for an Na ion? Choose the answer from the following four choices: (a) Cl- interstitial, (b) Na+ vacancy, (c) Cl- interstitial and Na+ vacancy, and (d) Na+ interstitial.
Answer: (b)
Question: At which coordination number the minimum cation-to-anion radius ratio is 0.225? Choose the answer from the following four choices: (a) 3, (b) 4, (c) 6, and (d) 8.
Answer: (b)
Question: On the basis of ionic charge and ionic radii, Cs+ 0.170 nm and I- 0.220 nm, predict crystal structures of CsI. Choose the answer from the following four choices: (a) Rock salt, (b) Zinc blende, (c) Cesium chloride, and (d) Fluorite.
Answer: (c)
Question: The zinc blende crystal structure is one that may be generated from close-packed planes of anions. 
Will the stacking sequence for this structure be FCC or HCP?
Will cations fill tetrahedral or octahedral positions?
Answer the two questions, by connecting comma. Choose the answer from the following four choices: (a) HCP, tetrahedral, (b) HCP, octahedral, (c) FCC, tetrahedral, and (d) FCC, octahedral.

Answer: (c)
Question: Iron sulfide (FeS) may form a crystal structure that consists of an HCP arrangement of S2 ions.
Which type of interstitial site will the Fe2 ions occupy?
What fraction of these available interstitial sites will be occupied by Fe2 ions?
 Answer the two questions, by connecting comma. Choose the answer from the following four choices: (a) octahedral, all, (b)octahedral, half , (c) tetrahedral, all, and (d) tetrahedral, 2/3.

Answer: (a)
Question: Magnesium oxide has the rock salt crystal structure and a density of 3.58 g/cm3.
Calculate the unit cell edge length (nm). Choose the answer from the following four choices: (a) 0.421, (b) 0.334, (c) 0.265, and (d) 0.212.
Answer: (a)
Question: Using the ionic radii Cs+ 0.170 nm and Cl- 0.181 nm, calculate the theoretical density (g/cm^3) of CsCl. Choose the answer from the following four choices: (a) 1.2, (b) 5.9, (c) 4.2, and (d) 2.3.
Answer: (c)
Question: A hypothetical AX type of ceramic material is known to have a density of 2.65 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.43 nm.The atomic weights of the A and X elements are 86.6 and 40.3 g/mol, respectively. On the basis of this information, which of the following crystal structures is (are) possible for this material: rock salt, cesium chloride, or zinc blende? Choose the answer from the following four choices: (a) rock salt, (b) Cesium chloride, (c) rock salt and cesium chloride, and (d) zinc blend.

Answer: (b)
Question: Calculate the atomic packing factor for cesium chloride using the ionic radii Cs 0.170 nm Cl 0.181 nm, and assuming that the ions touch along the cube diagonals. Choose the answer from the following four choices: (a) 0.13, (b) 0.34, (c) 0.68, and (d) 0.37.
Answer: (c)
Question: Suppose that Li2O is added as an impurity to CaO. If the Li+ substitutes for Ca2+, what kind of vacancies would you expect to form? How many of these vacancies are created for every Li+ added? Choose the answer from the following four choices: (a) O2 vacancy; one O2 vacancy for every two Li added, (b) Ca vacancy; one for every two Li added, (c) O2 vacancy; one for every one Li added, and (d) Ca vacancy; one for every one Li added.

Answer: (a)
Question: A three-point bending test was performed on an aluminum oxide specimen having a circular cross section of radius 3.5 mm; the specimen fractured at a load of 950 N when the distance between the support points was 50 mm. Another test is to be performed on a specimen of this same material, but one that has a square cross section of 12 mm length on each edge. At what load (N) would you expect this specimen to fracture if the support point separation is 40 mm? Choose the answer from the following four choices: (a) 140, (b) 89, (c) 1.0 x 10^4, and (d) 6.5 x 10^3.

Answer: (c)
Question: The modulus of elasticity for beryllium oxide (BeO) having 5 vol% porosity is 310 GPa.
Calculate the modulus of elasticity (GPa) for the nonporous material. Choose the answer from the following four choices: (a) 326, (b) 342, (c) 281, and (d) 4.28 x 10^3.
Answer: (b)
Question: A continuous and aligned glass fiber–reinforced composite consists of 40 vol% of glass fibers having a modulus of elasticity of 69 GPa and 60 vol% of a polyester resin that, when hardened, displays a modulus of 3.4 GPa.
Calculate the modulus of elasticity (GPa) of this composite in the longitudinal direction. Choose the answer from the following four choices: (a)30 , (b) 43, (c) 26, and (d) 40.

Answer: (a)
Question: A tubular composite shaft is to be designed that has an outside diameter of 70 mm, an inside diameter of 50 mm, and a length of 1.0 m. The mechanical characteristic of prime importance is bending stiffness in terms of the longitudinal modulus of elasticity; strength and fatigue resistance are not significant parameters for this application when filament composites are used. Stiffness is to be specified as maximum allowable deflection in bending; when subjected to threepoint bending (support points at both tube extremities and load application at the longitudinal midpoint), a load of 1000 N is to produce an elastic deflection of no more than 0.35 mm at the midpoint position. Continuous fibers that are oriented parallel to the tube axis will be used; possible fiber materials are glass, and carbon in standard-, intermediate-, and high-modulus grades. The matrix material is to be an epoxy resin, and the maximum allowable fiber volume fraction is 0.60. This design problem calls for us to do the following:
Decide which of the four fiber materials, when embedded in the epoxy matrix, meet the stipulated criteria. Choose the answer from the following four choices: (a) glass fiber, (b) Carbon (standard modulus), (c) Carbon (high modulus), and (d) Carbon (standard modulus), Carbon (intermediate modulus), Carbon (high modulus).

Answer: (d)
Question: For a glass fiber–epoxy matrix combination, the critical fiber length–fiber diameter ratio is 50. Using the data on the glass below: specific gravity = 2.58, tensile strength = 3.45 GPa, specific strength = 1.34 GPa, modulus of elasticity = 72.5 GPa, specific modulus = 28.1 GPa, calculate the fiber-matrix bond strength (MPa). Choose the answer from the following four choices: (a) 69, (b) 34.5, (c) 13.5, and (d) 281.

Answer: (b)
Question: Assume a continuous and aligned fiber–reinforced composite is to be produced consisting of 30 vol% aramid fibers and 70 vol% of a polycarbonate matrix, where the modulus of elasticity and tensile strength of armid fire are 131 GPa and 3600 MPa, those of polycarbonate are 2.4 GPa and 65 MPa. It has a cross-sectional area of 320 mm2 and is subjected to a longitudinal load of 44,500 N.
Calculate the fiber–matrix load ratio. Choose the answer from the following four choices: (a) 128, (b) 0.0079, (c) 0.042, and (d) 23.4.

Answer: (d)
Question: Calculate the longitudinal strength (MPa) of an aligned carbon fiber–epoxy matrix composite having a 0.25 volume fraction of fibers, assuming the following: (1) an average fiber diameter of 10 x 10^-3 mm, (2) an average fiber length of 5 mm, (3) a fiber fracture strength of 2.5 GPa, (4) a fiber-matrix bond strength of 80 MPa, (5) a matrix stress at fiber failure of 10.0 MPa, and (6) a matrix tensile strength of 75 MPa. Choose the answer from the following four choices: (a) 76, (b) 1878, (c) 79, and (d) 633.

Answer: (d)
Question: Calculate the longitudinal tensile strength (MPa) of an aligned glass fiber–epoxy matrix composite in which the average fiber diameter and length are 0.010 mm and 2.5 mm, respectively, and the volume fraction of fibers is 0.40. Assume that (1) the fiber-matrix bond strength is 75 MPa, (2) the fracture strength of the fibers is 3500 MPa, and (3) the matrix stress at fiber failure is 8.0 MPa. Choose the answer from the following four choices: (a) 35, (b) 1079, (c) 1340, and (d) 7505.

Answer: (c)
Question: It is desired to produce an aligned and continuous fiber–reinforced epoxy composite having a maximum of 50 vol% fibers. In addition, a minimum longitudinal modulus of elasticity of 50 GPa is required, as well as a minimum tensile strength of 1300 MPa. Of E-glass, carbon (PAN standard modulus), and aramid fiber materials, which are possible candidates? The epoxy has a modulus of elasticity of 3.1 GPa and a tensile strength of 75 MPa. In addition, assume the following stress levels on the epoxy matrix at fiber failure:
E-glass—70 MPa; carbon (PAN standard modulus)—30 MPa; and aramid—50 MPa. Choose the answer from the following four choices: (a) E-glass, (b) E-glass and aramid, (c) Carbon (PAN standard-modulus) and aramid, and (d) Carbon (PAN standard-modulus).

Answer: (c)
Question: One-half of an electrochemical cell consists of a pure nickel electrode in a solution of Ni2+ ions; the other half is a cadmium electrode immersed in a Cd2+ solution.
Calculate the cell potential (V) at 25 ℃ if the Cd2+ and Ni2+ concentrations are 1 M. Choose the answer from the following four choices: (a) 0.153, (b) 0.653, (c) -0.653, and (d) -0.153.
Answer: (a)
Question: Calculate the voltage (V) at 25ºC of an electrochemical cell consisting of pure cadmium immersed in a 2 x 10^(-3) M solution of Cd2+ ions, and pure iron in a 0.4 M solution of Fe2+ ions. Choose the answer from the following four choices: (a) -0.031, (b) -0.105, (c) 0.105, and (d) 0.031.
Answer: (d)
Question: A piece of corroded steel plate was found in a submerged ocean vessel. It was estimated that the original area of the plate was 10 in.2 and that approximately 2.6 kg had corroded away during the submersion. Assuming a corrosion penetration rate of 200 mpy for this alloy in seawater, estimate the time of submersion in years. The density of steel is 7.9 g/cm3. Choose the answer from the following four choices: (a) 1.6, (b) 10, (c) 88000, and (d) 88.

Answer: (b)
Question: For Sn, calculate the Pilling–Bedworth ratio using metal density of 7.30 (g/cm3), and the density of metal oxide SnO2 is 6.95 (g/cm3). Also, on the basis of this value, specify whether you would expect the oxide scale that forms on the surface to be protective. Choose the answer from the following four choices: (a) 1.33, unprotective, (b) 1.33, protective, (c) 0.75, unprotective, and (d) 0.75, protective.

Answer: (b)
Question: In the following table, weight gain–time data for the oxidation of copper at an elevated temperature are given.
W (mg/cm2) Time (min)
0.316 15
0.524 50
0.725 100
Determine which type of function the oxidation kinetics obey. Choose the answer from the following four choices: (a) linear, (b) parabolic , (c) exponential, and (d) logarithmic.
ChatGPT

Answer: (b)
Question: Which of ZnS and CdSe will have the larger band gap energy Eg? Cite reason for your choice. Choose the answer from the following four choices: (a) ZnS, more ionic bonding, (b) CdSe, more ionic bonding, (c) ZnS, less ionic bonding, and (d) CdSe, less ionic bonding.

Answer: (a)
Question: For intrinsic gallium arsenide, the room-temperature electrical conductivity is 10^-6 (Ω∙m)^-1; the electron and hole mobilities are, respectively, 0.85 and 0.04 m2/V∙s. Calculate the intrinsic carrier concentration (m^-3) at room temperature. Choose the answer from the following four choices: (a) 1.1 x 10^-6, (b) 1.6 x 10^14, (c) 7.0 x 10^12, and (d) 8.9 x 10^5.
Answer: (c)
Question: The electrical conductivity and electron mobility for aluminum are 3.8 x 10^7 (Ω∙m)^-1 and 0.0012 m^2/V∙s, respectively. Calculate the Hall voltage (V) for an aluminum specimen that is 15 mm thick for a current of 25 A and a magnetic field of 0.6 tesla (imposed in a direction perpendicular to the current). Choose the answer from the following four choices: (a) -3.16 x 10^-11, (b) -3.16 x 10^-14, (c) -3.16 x 10^-8, and (d) -1.40 x 10^-10.

Answer: (c)
Question: Consider a parallel-plate capacitor having an area of 6.45 x 10^-4 m2 and a plate separation of 2 x 10^-3 m across which a potential of 10 V is applied. If a material having a dielectric constant of 6.0 is positioned within the region between the plates, calculate the capacitance (F) and the magnitude of the charge (C) stored on each plate. Choose the answer from the following four choices: (a) 1.71 x 10^-11, 1.71 x 10^-12, (b) 1.71 x 10^-11, 1.71 x 10^-10, (c) 1.65 x 10^-10, 1.65 x 10^-9, and (d) 1.65 x 10^-10, 1.65 x 10^-11.

Answer: (b)
Question: A copper wire 100 m long must experience a voltage drop of less than 1.5 V when a current of 2.5 A passes through it. Electrical conductivity of copper is 6.0 x 10^7 [(Ω∙m)^-1]. calculate the minimum diameter (mm) of the wire. Choose the answer from the following four choices: (a) 1.88, (b) 0.94, (c) 2.78, and (d) 0.75.
Answer: (a)
Question: electrical conductivity of copper is 6.0 x 10^7 [(Ω∙m)^-1]. What would be the current flow (A) of a copper wire 3 mm in diameter and 2 m long if the potential drop across the ends of the wire is 0.05 V? Choose the answer from the following four choices: (a) 0.106, (b) 3.38, (c) 4.24, and (d) 0.6.
Answer: (d)
Question: At room temperature the electrical conductivity and the electron mobility for copper are 6.0 x 10^7 (Ω∙m)^-1 and 0.0030 m^2/V∙s, respectively. Compute the number of free electrons per cubic meter for copper at room temperature. Assume a density of 8.9 g/cm3. Choose the answer from the following four choices: (a) 1.13 x 10^24, (b) 1.25 x 10^29 m^-3, (c) 1.11 x 10^30, and (d) 1.40 x 10^28.

Answer: (b)
Question: An n-type semiconductor is known to have an electron concentration of 3 x 10^18 m^-3. If the electron drift velocity is 100 m/s in an electric field of 500 V/m, calculate the conductivity ([Ω∙m]^-1) of this material. Choose the answer from the following four choices: (a) 0.096, (b) 2.4, (c) 6 x 10^17, and (d) 0.111.

Answer: (a)
Question: The following electrical characteristics have been determined for both intrinsic and p-type extrinsic indium phosphide (InP) at room temperature:
        σ (Ω∙m)^-1  n (m^-3)  p (m^-3)
Intrinsic 2.5x10^-6  3.0x10^13  3.0x10^13
Extrinsic(n-type) 3.6x10^-5  4.5x10^14  2.0x10^12
Calculate electron and hole mobilities (m2/V∙s). Choose the answer from the following four choices: (a) 0.50, 0.31, (b) 0.50, 0.02, (c) 1.1, 0.02, and (d) 1.1, 0.31.

Answer: (b)
Question: How the conductivity changes when temperature increase, for metals and intrinsic semiconductors, respectively? Choose the answer from the following four choices: (a) metals: increase; semiconductors: increase, (b) metals: increase; semiconductors: decrease, (c) metals: decrease; semiconductors: increase, and (d) metals: decrease; semiconductors: decrease.
Answer: (c)
Question: A metal alloy is known to have electrical conductivity and electron mobility values of 1.5 x 10^7 (Ω∙m)^-1 and 0.0020 m2/V s, respectively. Through a specimen of this alloy that is 35 mm thick is passed a current of 45 A. What magnetic field (T) would need to be imposed to yield a Hall voltage of -1.0 x 10^-7 V? Choose the answer from the following four choices: (a) 0.58, (b) 1181, (c) 0.002, and (d) 583.
Answer: (a)
Question: A parallel-plate capacitor using a dielectric material having a dielectric constant of 2.5 has a plate spacing of 1 mm. If another material having a dielectric constant of 4.0 is used and the capacitance is to be unchanged, what must be the new spacing (mm) between the plates? Choose the answer from the following four choices: (a) 0.625, (b) 16, (c) 6.25, and (d) 1.6.
Answer: (d)
Question: For NaCl, the ionic radii for Na and Cl ions are 0.102 and 0.181 nm, respectively. If an externally applied electric field produces a 5% expansion of the lattice, calculate the dipole moment (C∙m) for each Na –Cl pair. Choose the answer from the following four choices: (a) 4.75 x 10^-29, (b) 2.05 x 10^-30, (c) 4.30 x 10^-29, and (d) 2.26 x 10^-30. Assume that this material is completely unpolarized in the absence of an electric field. 

Answer: (d)
Question: A charge of 3.5 x 10^-11 C is to be stored on each plate of a parallel-plate capacitor having an area of 160 mm2 and a plate separation of 3.5 mm.
What voltage (V) is required if a material having a dielectric constant of 5.0 is positioned within the plates? Choose the answer from the following four choices: (a) 0.17, (b) 0.04, (c) 17.3, and (d) 3.62.

Answer: (c)
Question: why, on a cold day, the metal door handle of an automobile feels colder to the touch than a plastic steering wheel, even though both are at the same temperature? Choose the answer from the following four choices: (a) metal is harder, (b) metal has high electric conductivity, (c) metal has low elastisity, and (d) metal has high thermal conductivity.
Answer: (d)
Question: A brass rod is to be used in an application requiring its ends to be held rigid. If the rod is stress free at room temperature (20 ℃), what is the maximum temperature (℃) to which the rod may be heated without exceeding a compressive stress of 172 MPa? Assume a modulus of elasticity of 100 GPa for brass. Choose the answer from the following four choices: (a) 86, (b) 49, (c) 880, and (d) 106.

Answer: (d)
Question: For aluminum, the heat capacity at constant volume at 30 K is 0.81 J/mol∙K, and the Debye temperature is 375 K. Estimate the specific heat (J/kg∙K) at 50 K and at 425 K. Choose the answer from the following four choices: (a) 3.75, 85358, (b) 101, 62134, (c) 139, 85358, and (d) 139, 923.
Answer: (d)
Question: For each of the following pairs of materials, decide which has the larger thermal conductivity by inequality sign. Choose the answer from the following four choices: (a) (1)>, (2)<, (3)>, (b) (1)<, (2)<, (3)>, (c) (1)>, (2)>, (3)<, and (d) (1)<, (2)>, (3)<.
(1) Pure copper; aluminum bronze (95 wt% Cu–5 wt% Al)
(2) Fused silica; quartz
(3) Linear polyethylene; branched polyethylene

Answer: (a)
Question: If a rod of 1025 steel 0.5 m long is heated from 20 to 80 ℃ while its ends are maintained rigid, determine the magnitude (MPa) and the type of stress that develops. Assume that at 20 ℃ the rod is stress free. Choose the answer from the following four choices: (a) 70, compression, (b) 150, tension, (c) 200, tension, and (d) 150, compression.
Answer: (d)
Question: Railroad tracks made of 1025 steel are to be laid during the time of year when the temperature averages 10 ℃. If a joint space of 4.6 mm is allowed between the standard 11.9-m-long rails, what is the hottest possible temperature (℃) that can be tolerated without the introduction of thermal stresses? Choose the answer from the following four choices: (a) 32.2, (b) 50.2, (c) 42.2, and (d) 45.2.

Answer: (c)
Question: Calculate the saturation magnetization (A/m) for nickel, which has a density of 8.90 g/cm3. Choose the answer from the following four choices: (a) 5.1 x 10^5, (b) 1.9 x 10^6, (c) 1.5 x 10^6, and (d) 0.51.
Answer: (a)