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Question 1 (1 point) Which is a single crystal? Steel Silicon wafer Mercury amalgam brass Questio...
Aluminum is diffused into a wafer of single crystal high purity silicon at a temperature of...
Aluminum is diffused into a wafer of single crystal high purity silicon at a temperature of 1100°C. Assume that the surface concentration is 1x1018 atoms Al/cm3, and the D- 2x10-12 cm2/s for aluminum diffusing into silicon at 1100°C. (a) On the right, draw a graph showing the aluminum concentration (y-axis) versus depth (x-axis) at an arbitrary time t#0. (1 pt) (b) At 1100°C, how many hours will it take to reach a concentration of 1x1017 atoms Al/cm3 at a depth...
1. General Silicon Crystal (2 points) Which answer does NOT represent the characteristic of silicon (Si)?...
1. General Silicon Crystal (2 points) Which answer does NOT represent the characteristic of silicon (Si)? (a) Low bandgap and high leakage current. (b) Low material cost. (c) Excellent quality of silicon dioxide. (d) High bandgap and low leakage current.
BRASS STEEL ti ods Problem 1. Torque To is applied at the midpoint of a solid...
BRASS STEEL ti ods Problem 1. Torque To is applied at the midpoint of a solid steel bar with diameter ds and length 1.5 L which is bonded to two brass collars, each with wall thickness to and length 0.25 L. The twist angle at point C is specified to be an allowable angle oca. To I 1 А B с E a L va 2 4 L The steel bar and brass collars are attached to fixed supports at...
1. a)The mass of Mercury is 3.3 × 10^23??. About 30% of its total mass is...
1. a)The mass of Mercury is 3.3 × 10^23??. About 30% of its total mass is silicate material. Assume that we are able to convert 0.1% of the mass of the silicate material on Mercury to crystalline silicon, how many solar panels can we build? Also assume that our solar panels are square-shaped sheets completely made out of crystalline silicon. Use the following numbers for your estimation: density of silicon is 2300??/?^3 ; thickness of the solar panels is 0.5??;...
Which of the following statements are true? 1. Glass is mostly silicon dioxide and so when...
Which of the following statements are true? 1. Glass is mostly silicon dioxide and so when a long narrow glass tube is placed into water, the water molecules form adhesive forces with the oxygen atoms in the molecules of the glass 2. The Shape of the meniscus seen when water is poured into a glass container is due to cohesive forms being greater than the adhesive forced being experienced. 3. When a glass tube is placed into a dish of...
Consider a deuterium atom (1 electron orbiting one proton and one proton). Calculate the energy required...
Consider a deuterium atom (1 electron orbiting one proton and one proton). Calculate the energy required to excite an electron in the H atom from the first (n = 2) excited state to the third (n = 4) excited state Calculate the wavelength of the corresponding photon required to create this excitation. Is it in the visible, ultraviolet, or infrared portion of the electromagnetic spectrum? Imagine a large single-crystal wafer of silicon (Si), where a Si atom is replaced by...
- H/500 Question 2. A magnetic circuit in figure is made of silicon steel, for which...
- H/500 Question 2. A magnetic circuit in figure is made of silicon steel, for which the B-H relationship is given as B = 2(1 - e 500). The outer legs have 500 turns each. It is required to establish a flux of 3.6 mWb in the air-gap by applying equal currents to both windings. What is the current in each winding? 50 0.4 50 (All dimensions in centimeters)
Figure below shows a cross section of n-type silicon wafer (region 1, Np-1015 /cm3) into which...
Figure below shows a cross section of n-type silicon wafer (region 1, Np-1015 /cm3) into which we diffuse p-type dopant (region 2, NA-5x1016 /cm3). Then, we diffuse n- type dopant (region 3, ND-1019 em) into the area that we had introduced p-type dopant. 1. What is the electron and hole concentration in region 3? Region 3 Region 2 Region 1, n-type (1) n-1019. p-5x1016 (5) n-109, p-10 (2) n-1015, p-5x1016 (6) none of those (3) n-1019, p=o"6 (4) n-10, p-1019
d. Full production phase 2. Which is statement i FALSE df lominy test a. The results...
d. Full production phase 2. Which is statement i FALSE df lominy test a. The results from the test will indicate if a material can be successfully case hardened b. The metal hardness can be measured by a durometer c. The resulting hardenability curve plots hardness versus distance from the d. A metal sample is cooled quickly by submerging in water Machi inin quenched end 3. A 30mm diameter piece of bar stock in a lathe has a surface speed...
Question 1 (1 point) Solids, liquids and gaseous phases of matter may interact by van der Waals forces, which are...
Question 1 (1 point) Solids, liquids and gaseous phases of matter may interact by van der Waals forces, which are weak electrostatic intermolecular bonds that form between neutral molecules. True False Question 2 (1 point) Hydrogen bonding is the only type of van der Waals force exhibited in the water molecule. True False Question 3 (1 point) Solids may be classified as crystalline or amorphous. True False Question 4 (1 point) Solid to liquid phase is known as sublimation. aaPM...
Aluminum is diffused into a wafer of single crystal high purity silicon at a temperature of 1100°C. Assume that the surface concentration is 1x1018 atoms Al/cm3, and the D- 2x10-12 cm2/s for aluminum diffusing into silicon at 1100°C. (a) On the right, draw a graph showing the aluminum concentration (y-axis) versus depth (x-axis) at an arbitrary time t#0. (1 pt) (b) At 1100°C, how many hours will it take to reach a concentration of 1x1017 atoms Al/cm3 at a depth...
1. General Silicon Crystal (2 points) Which answer does NOT represent the characteristic of silicon (Si)? (a) Low bandgap and high leakage current. (b) Low material cost. (c) Excellent quality of silicon dioxide. (d) High bandgap and low leakage current.
BRASS STEEL ti ods Problem 1. Torque To is applied at the midpoint of a solid steel bar with diameter ds and length 1.5 L which is bonded to two brass collars, each with wall thickness to and length 0.25 L. The twist angle at point C is specified to be an allowable angle oca. To I 1 А B с E a L va 2 4 L The steel bar and brass collars are attached to fixed supports at...
Consider a deuterium atom (1 electron orbiting one proton and one proton). Calculate the energy required to excite an electron in the H atom from the first (n = 2) excited state to the third (n = 4) excited state Calculate the wavelength of the corresponding photon required to create this excitation. Is it in the visible, ultraviolet, or infrared portion of the electromagnetic spectrum? Imagine a large single-crystal wafer of silicon (Si), where a Si atom is replaced by...
- H/500 Question 2. A magnetic circuit in figure is made of silicon steel, for which the B-H relationship is given as B = 2(1 - e 500). The outer legs have 500 turns each. It is required to establish a flux of 3.6 mWb in the air-gap by applying equal currents to both windings. What is the current in each winding? 50 0.4 50 (All dimensions in centimeters)
Figure below shows a cross section of n-type silicon wafer (region 1, Np-1015 /cm3) into which we diffuse p-type dopant (region 2, NA-5x1016 /cm3). Then, we diffuse n- type dopant (region 3, ND-1019 em) into the area that we had introduced p-type dopant. 1. What is the electron and hole concentration in region 3? Region 3 Region 2 Region 1, n-type (1) n-1019. p-5x1016 (5) n-109, p-10 (2) n-1015, p-5x1016 (6) none of those (3) n-1019, p=o"6 (4) n-10, p-1019
d. Full production phase 2. Which is statement i FALSE df lominy test a. The results from the test will indicate if a material can be successfully case hardened b. The metal hardness can be measured by a durometer c. The resulting hardenability curve plots hardness versus distance from the d. A metal sample is cooled quickly by submerging in water Machi inin quenched end 3. A 30mm diameter piece of bar stock in a lathe has a surface speed...
Question 1 (1 point) Solids, liquids and gaseous phases of matter may interact by van der Waals forces, which are weak electrostatic intermolecular bonds that form between neutral molecules. True False Question 2 (1 point) Hydrogen bonding is the only type of van der Waals force exhibited in the water molecule. True False Question 3 (1 point) Solids may be classified as crystalline or amorphous. True False Question 4 (1 point) Solid to liquid phase is known as sublimation. aaPM...
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