Homework Answers
The atomic energy levels of a single atom is discrete. But when more than one atom is held together, the energy level gets split.
If there are 2 atoms, there will be two discrete energy levels, for each energy level that was present in the single atom.
For N atoms, there will be N energy levels.
Now, in the case of aluminium, the 2p orbital is completely filled.
In a 2p sub band, there are 3 discrete energy levels
So, if there are N atoms in the nano particle, this will split into 3N energy levels.
Here, N = 8.4*106 atoms.
So, no of discrete energy levels = 3*N = 3*8.4*106 = 2.52*107 energy levels.
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5. Imagine that an aluminum nanoparticle has 8.4 x 106 atoms and has an energy band...
3. There are two Ga Al As LED's. One has a band energy gap of 1.540eV and the other has a band gap Energy unknown, but has x-0.15. 3.1. Find the aluminum mole fraction of x and the emission w...
3. There are two Ga Al As LED's. One has a band energy gap of 1.540eV and the other has a band gap Energy unknown, but has x-0.15. 3.1. Find the aluminum mole fraction of x and the emission wavelength for the first Light emitting diod. 32. Determine the band-gap energy. Eg and the emission wavelength, λ of the second LED. nt E.424 1.26G 0.GG 1240 A 4 1:24o Gac,
3. There are two Ga Al As LED's. One has...
2). Rough estimation of the diameter of an aluminum atom: Given aluminum density as p-2.7*10 kg/m',...
2). Rough estimation of the diameter of an aluminum atom: Given aluminum density as p-2.7*10 kg/m', atomic weight is 27 (i.e. the mass of 1 mole of aluminum atoms is 27g. Imole 6.02x10 ). Assume atoms of aluminum metal are spherical with spaces in between the aluminum atoms take up 74.1% of the volume of the material. What is the diameter of an aluminum atom? (Note: Volume of a sphere with radius ris: V-(4/3)xr) 4. (20") (1). In E-beam lithography,...
2. (a) Assuming Anderson's rule and Vegard's law calculate the depth of the confining potential in meV, for holes in the valence band of a InAs/InxGa1-xAs multi QW structure where x-0.5. [5]...
2. (a) Assuming Anderson's rule and Vegard's law calculate the depth of the confining potential in meV, for holes in the valence band of a InAs/InxGa1-xAs multi QW structure where x-0.5. [5] State whether electron and hole confinement is within the InAs or InGaAs layers, and hence deduce what type of structure/band alignment this is. Suggest why this structure might be difficult to grow experimentally. (b) A Gao.47lno.53As quantum well laser is designed to emit at 1.55um at room temperature...
Suppose you have a very small sample of the orthorhombic crystal (orthorhombic, lattice constants 5.3 Å,...
Suppose you have a very small sample of the orthorhombic crystal (orthorhombic, lattice constants 5.3 Å, 5.4 Å and 5.5 Å). The crystal is 53 nm x 54nm x 55 nm oriented along the respective axis. [2] Show for this crystal, there are one million atoms. [2] If the crystal has dimensions 53nmx54nmx55nm, calculate the smallest and largest phonon wave vectors for this crystal (state answer in mks). [2] What exactly is a phonon and why do we use them? [2]...
Name: Chapter 7 Quiz In one experiment you reacted 45.78 of Aluminum with 182.8 g of...
Name: Chapter 7 Quiz In one experiment you reacted 45.78 of Aluminum with 182.8 g of Iron (III) oxide to produce Aluminum Oxide and Elemental iron (not diatomic). (10 pts each) a) Write and balance the chemical formula, What type of reaction was it? b) Identify the chemical that is being reduced? c) How many mols of Iron(Ill) oxide do you have? d) Which is the limiting reagent? e) How many grams of Aluminum Oxide did you produced? f) What...
(5) Ammonia has a Cav symmetry - how many unshifted atoms are there for each operation?...
(5) Ammonia has a Cav symmetry - how many unshifted atoms are there for each operation? Tip: Draw the structure of ammonia, NH3, don't forget the lone pair! 3 pts Which physical properties of molecules can be determined based on character tables? +2 extra
1) Arrange the following in the expected order of increasing boiling point: Ne, He, Cl, (CH3)2CO...
1) Arrange the following in the expected order of increasing boiling point: Ne, He, Cl, (CH3)2CO and O2. 2) a) Sketch a plausible phase diagram for hydrazine (N2H) from the data provided below: triple point (2.0 °C and 3.4 mmHg), normal boiling point (113.5 °C) and critical point (380 °C and 145 atm). The density of the liquid is less than that of the solid. b) Label the different regions of the diagram corresponding to the 3 states of matter....
28) A sample of sulfur contains 1.81 x 1024 atoms of sulfur How many moles of...
28) A sample of sulfur contains 1.81 x 1024 atoms of sulfur How many moles of sulfur 28) does this represent? A) 3.01 mol B) 1.81 mol C) 1.77 mol D) 1.09 mol E) 0.333 mol 29) When the equation below is balanced with the lowest possible whole number coefficients, what is the sum of the coefficients? 29) Ca(s) + HCl(r) → CaCl2(s) + H26) A) 2 B) 5 C) 4 D) 8 E) 10 o) Aspirin is the common...
choices: a,b) 0, 1, 2, 3, 4, 5, 6 c,d,e) A, B, C, D Question 3...
choices:
a,b) 0, 1, 2, 3, 4, 5, 6
c,d,e) A, B, C, D
Question 3 1 pts The following diagram is an incomplete Lewis structure of a neutral molecule, with only atoms and skeletal bonds shown. Answer the questions that follow based on this molecule. Incomplete Lewis Diagram Skeleton 2C-N-H H-C1 H a) How many atoms contain unhybridized p-orbitals? (Select] b) How many unhybridized p-orbitals are there in the entire molecule? [Select] Parts C-E show diagrams of hybridized and...
question no 4.22, statistical physics by Reif Volume 5 4.92 Mean energy of a harmonic oscillator A harmonic oscillator...
question no 4.22, statistical physics by Reif Volume 5
4.92 Mean energy of a harmonic oscillator A harmonic oscillator has a mass and spring constant which are such that its classical angular frequency of oscllation is equal to w. In a quantum- mechanical description, such an oscillator is characterized by a set of discrete states having energies En given by The quantum number n which labels these states can here assume all the integral values A particular instance of a...
3. There are two Ga Al As LED's. One has a band energy gap of 1.540eV and the other has a band gap Energy unknown, but has x-0.15. 3.1. Find the aluminum mole fraction of x and the emission wavelength for the first Light emitting diod. 32. Determine the band-gap energy. Eg and the emission wavelength, λ of the second LED. nt E.424 1.26G 0.GG 1240 A 4 1:24o Gac,
3. There are two Ga Al As LED's. One has...
2). Rough estimation of the diameter of an aluminum atom: Given aluminum density as p-2.7*10 kg/m', atomic weight is 27 (i.e. the mass of 1 mole of aluminum atoms is 27g. Imole 6.02x10 ). Assume atoms of aluminum metal are spherical with spaces in between the aluminum atoms take up 74.1% of the volume of the material. What is the diameter of an aluminum atom? (Note: Volume of a sphere with radius ris: V-(4/3)xr) 4. (20") (1). In E-beam lithography,...
2. (a) Assuming Anderson's rule and Vegard's law calculate the depth of the confining potential in meV, for holes in the valence band of a InAs/InxGa1-xAs multi QW structure where x-0.5. [5] State whether electron and hole confinement is within the InAs or InGaAs layers, and hence deduce what type of structure/band alignment this is. Suggest why this structure might be difficult to grow experimentally. (b) A Gao.47lno.53As quantum well laser is designed to emit at 1.55um at room temperature...
Name: Chapter 7 Quiz In one experiment you reacted 45.78 of Aluminum with 182.8 g of Iron (III) oxide to produce Aluminum Oxide and Elemental iron (not diatomic). (10 pts each) a) Write and balance the chemical formula, What type of reaction was it? b) Identify the chemical that is being reduced? c) How many mols of Iron(Ill) oxide do you have? d) Which is the limiting reagent? e) How many grams of Aluminum Oxide did you produced? f) What...
(5) Ammonia has a Cav symmetry - how many unshifted atoms are there for each operation? Tip: Draw the structure of ammonia, NH3, don't forget the lone pair! 3 pts Which physical properties of molecules can be determined based on character tables? +2 extra
1) Arrange the following in the expected order of increasing boiling point: Ne, He, Cl, (CH3)2CO and O2. 2) a) Sketch a plausible phase diagram for hydrazine (N2H) from the data provided below: triple point (2.0 °C and 3.4 mmHg), normal boiling point (113.5 °C) and critical point (380 °C and 145 atm). The density of the liquid is less than that of the solid. b) Label the different regions of the diagram corresponding to the 3 states of matter....
28) A sample of sulfur contains 1.81 x 1024 atoms of sulfur How many moles of sulfur 28) does this represent? A) 3.01 mol B) 1.81 mol C) 1.77 mol D) 1.09 mol E) 0.333 mol 29) When the equation below is balanced with the lowest possible whole number coefficients, what is the sum of the coefficients? 29) Ca(s) + HCl(r) → CaCl2(s) + H26) A) 2 B) 5 C) 4 D) 8 E) 10 o) Aspirin is the common...
choices:
a,b) 0, 1, 2, 3, 4, 5, 6
c,d,e) A, B, C, D
Question 3 1 pts The following diagram is an incomplete Lewis structure of a neutral molecule, with only atoms and skeletal bonds shown. Answer the questions that follow based on this molecule. Incomplete Lewis Diagram Skeleton 2C-N-H H-C1 H a) How many atoms contain unhybridized p-orbitals? (Select] b) How many unhybridized p-orbitals are there in the entire molecule? [Select] Parts C-E show diagrams of hybridized and...
question no 4.22, statistical physics by Reif Volume 5
4.92 Mean energy of a harmonic oscillator A harmonic oscillator has a mass and spring constant which are such that its classical angular frequency of oscllation is equal to w. In a quantum- mechanical description, such an oscillator is characterized by a set of discrete states having energies En given by The quantum number n which labels these states can here assume all the integral values A particular instance of a...
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