from the model of molecular orbitals, explain why we can say that at T = 0,...
from the model of molecular orbitals, explain why we can say that at T = 0, the valence band is totally full, the conduction band is totally empty for a crystal for a pure crystal
Homework Answers
In the atomic model the electrons are restricted to move around a single atom but in case of molecules the electron moves in the combined effect of atoms. At T=0 the outer most electron which is loosely bounded to the nucleus called the Valence electron, such electrons will constitute Valence band but there are some empty levels that constitutes conduction band.As temperature increases theelectrons of valence band will jump in the unoccupied levels of the band called conduction band.
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from the model of molecular orbitals, explain why we can say
that at T = 0,...
(2) In a semiconductor with an energy gap Eg between the valence and the conduction bands we can take Ef (the Fermi ene...
(2) In a semiconductor with an energy gap Eg between the valence and the conduction bands we can take Ef (the Fermi energy) to be halfway between the bands (see figure below): Conduction band Energy gap Eg Valence band Semiconductor a. Show that for a typical semiconductor or insulator at room temperature the Fermi- Dirac factor is approximately equal to exp(-E 2kBT). (Typical Eg for semi-conductors ranges from about 0.5eV to 6eV at T-293K.) b. In heavily doped n-type silicon,...
Crystal types are sometimes classified based on the type of bonding, for example ionic crystals. Name...
Crystal types are sometimes classified based on the type of bonding, for example ionic crystals. Name two other types of crystal. (b) A crystal is formed from N atoms. Give a brief description of the origin of energy bands in solids. (c) Sketch the band structure of an undoped semiconductor, label the conduction and valence bands, and the relevant energies. Mark the position of the Fermi energy. Make a second sketch and assume the semiconductor has been doped n -...
3. Many parameters of crystals are dependent on the band gap. a) From the optical absorption...
3. Many parameters of crystals are dependent on the band gap. a) From the optical absorption spectrum of a certain semiconductor, one finds that the longest wavelength of radiation absorbed is 1.40 m. What is the band gap for this semiconductor? Explain how the band gap gives rise to this behavior. b) What band gap would be needed to make blue (450 nm) LEDs? Explain why. c) Most of the sun's radiation has wavelengths shorter than 1000 nm. For a...
0 Explain the use of photoelectron spectroscopy (PES) in determining the energies of molecular orbitals. 5 marks (i) Briefly describe the operating principles of a photoelectron spectrometer. Use...
0 Explain the use of photoelectron spectroscopy (PES) in determining the energies of molecular orbitals. 5 marks (i) Briefly describe the operating principles of a photoelectron spectrometer. Use a diagram to illustrate your answer. 5 marks (İİİ) The highest energy peak in the He(I) PES of 02 is located at 10 eV. From your knowledge of this experiment, what information can be obtained about the molecular orbitals of O2? 5 marks (iv) The PE spectra of N2 and CO are...
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]...
Use a molecular orbital energy diagram to explain why we can never expect to see more...
Use a molecular orbital energy diagram to explain why we can never expect to see more than a triple bond.
Kinetic Molecular Theory (KMT) a. The KMT is a model we use to explain gas behavior....
Kinetic Molecular Theory (KMT) a. The KMT is a model we use to explain gas behavior. According to the KMT, what causes the pressure when a gas is held in a sealed container? b. Increasing the temperature will increase the pressure of a gas in a sealed container, assuming the volume remains constant. Explain why this is the case, according to the KMT?
say that the economy exists in an ecological system. How can we how the concept of 2. Explain what we mean when we a...
say that the economy exists in an ecological system. How can we how the concept of 2. Explain what we mean when we add the natural capital in a circular flow diagram, and why is it important? Discuss negative extemalities and property rights are related to pollution and resource degradation.
say that the economy exists in an ecological system. How can we how the concept of 2. Explain what we mean when we add the natural capital in a circular...
Q2: Explain why we can say that this circuit now has memory. 03 CLOCK2 RESET 2...
Q2: Explain why we can say that this circuit now has memory.
03 CLOCK2 RESET 2 DATA SET2 14 13 12 10 C04013 Top View Dual-In-Line Packag เส FIF CLOCK1 RESET 1 DATA SET 1 but in -12
Explain what we mean when we say that the economy exists in an ecological system. How can we add the natural capital in...
Explain what we mean when we say that the economy exists in an ecological system. How can we add the natural capital in a circular flow diagram, and why is it important? Discuss how the concept of negative externalities and property rights are related to pollution and resource degradation.
(2) In a semiconductor with an energy gap Eg between the valence and the conduction bands we can take Ef (the Fermi energy) to be halfway between the bands (see figure below): Conduction band Energy gap Eg Valence band Semiconductor a. Show that for a typical semiconductor or insulator at room temperature the Fermi- Dirac factor is approximately equal to exp(-E 2kBT). (Typical Eg for semi-conductors ranges from about 0.5eV to 6eV at T-293K.) b. In heavily doped n-type silicon,...
Crystal types are sometimes classified based on the type of bonding, for example ionic crystals. Name two other types of crystal. (b) A crystal is formed from N atoms. Give a brief description of the origin of energy bands in solids. (c) Sketch the band structure of an undoped semiconductor, label the conduction and valence bands, and the relevant energies. Mark the position of the Fermi energy. Make a second sketch and assume the semiconductor has been doped n -...
3. Many parameters of crystals are dependent on the band gap. a) From the optical absorption spectrum of a certain semiconductor, one finds that the longest wavelength of radiation absorbed is 1.40 m. What is the band gap for this semiconductor? Explain how the band gap gives rise to this behavior. b) What band gap would be needed to make blue (450 nm) LEDs? Explain why. c) Most of the sun's radiation has wavelengths shorter than 1000 nm. For a...
0 Explain the use of photoelectron spectroscopy (PES) in determining the energies of molecular orbitals. 5 marks (i) Briefly describe the operating principles of a photoelectron spectrometer. Use a diagram to illustrate your answer. 5 marks (İİİ) The highest energy peak in the He(I) PES of 02 is located at 10 eV. From your knowledge of this experiment, what information can be obtained about the molecular orbitals of O2? 5 marks (iv) The PE spectra of N2 and CO are...
Kinetic Molecular Theory (KMT) a. The KMT is a model we use to explain gas behavior. According to the KMT, what causes the pressure when a gas is held in a sealed container? b. Increasing the temperature will increase the pressure of a gas in a sealed container, assuming the volume remains constant. Explain why this is the case, according to the KMT?
say that the economy exists in an ecological system. How can we how the concept of 2. Explain what we mean when we add the natural capital in a circular flow diagram, and why is it important? Discuss negative extemalities and property rights are related to pollution and resource degradation.
say that the economy exists in an ecological system. How can we how the concept of 2. Explain what we mean when we add the natural capital in a circular...
Q2: Explain why we can say that this circuit now has memory.
03 CLOCK2 RESET 2 DATA SET2 14 13 12 10 C04013 Top View Dual-In-Line Packag เส FIF CLOCK1 RESET 1 DATA SET 1 but in -12
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