The crystalline solid, GaAs, has many applications in optoelectronics. The HOMO-LUMO electron band gap in crystalline GaAs is 1.52 eV. What is the wavelength (in nm) of a photon having this same energy?

Q: The first LEDs were made from GaAs, which has a bandgap of 1.43 eV. What wavelength of light would…

A: Unit of energy is converted as follows,

Q: Metal borides MBx exist for many transition metals.  a) What is the minimum radius for the host…

A: a) The radius of an atom in the octahedral void is related to the radius of the atoms forming the…

Q: Calcium carbonate crystals in the form of aragonite have orthorhombic unit cells of dimensions…

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Q: What is the trend in the size of the bandgap as you move down the column of the group 4A elements?

A: Band-In molecular orbitals of an atom the set of closely discrete energy levels is called as band.…

Q: Calculate the separations of the planes {123} and {236} in an orthorhombic crystal in which the unit…

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Q: In a semiconductor, the bonding molecular orbitals that contain electrons are referred to as the…

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Q: Assume that a GaAs semiconductor has a lattice constant a=7.5 Å, and the atoms of Ga and As are hard…

A: According to Bartlbey rules, expert have to attempt only 1 question unless specified so please post…

Q: The maximum wavelength of light that a certain silicon photocell can detect is 1.11 μm. (a) What is…

A: The energy difference between the top valence band and bottom of conduction band in terms of…

Q: Briefly describe the significance of anion gap?

A: We have to tell the significance of anion gap.

Q: How can we calculate the packing efficiency of the two-dimensional lattice?

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Q: Consider a two-dimensional crystal with rectangular shape, dimensions 10 um x1 um, lattice spacing…

A: Fermi energy level =  (lattice spacing )/2 or Energy gap /2

Q: 1) The volume of one ruthenium atom (molar mass = 101.1 g/mol) is 1.211x10 2³cm³. What would be the…

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Q: In band theory of bonding for solids, what is a band gap? How does the band gap differ in metals,…

A: Band-In molecular orbitals of an atom the set of closely discrete energy levels is called as band.…

Q: The unit cell for tin has tetragonal symmetry, with a and b lattice parameters of 0.583 and 0.318…

A: It is given that tin has a tetragonal symmetry and a and b are lattice parameters and their values…

Q: 20. A unit cell has the dimensions a = 4 A, b= 6 A, c = 8 A, x = ß = 90°, y = 120°. Determine: a)…

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Q: a) A solid substance is considered to be orthorhombic in nature. Since the edges of the unit cell…

A: The d is the interplanar spacing and it is defined by the spacing between the adjacent planes which…

Q: Which wavelength of light (in nm) is emitted if an electronmoves from the conduction band to the…

A: Energy of an electron is determined by using the formula E=hcλ E is energy. h is Planck's constant.…

Q: A substance has a band gap of 6.9 eV at 273 K. Is this substance best classified as an insulator, a…

A: In metals, two bands are continuous in terms of energy, so there is no band gap. In insulators, the…

Q: How may the conductivity of an intrinsic semiconductor be increased?

A: The intrinsic semiconductor is a type of semiconductor which is pure semiconductor, which has no…

Q: For the structure of ZnS as shown: Describe the packing of S2- according to the closest packing of…

A: As per the given structure of ZnS, the packing of S2- is FCC (face-centered cubic).  This form of…

Q: What is the difference in energy between the valence band and conduction band of electrical…

A: Insulators have large energy gapSemi conductors have somewhat less energy gap than insulators…

Q: Sketch the unit cell and in it show the following planes: (111), (210), and (003).

A: see below

Q: Explain the process of making an n -type and p -type semiconductor materials

A: p -type semiconductor : When a semiconductor ( Ge or Si ) is doped with electron deficient impurity…

Q: Which would you expect to be the more ductile element,(a) Ag or Mo, (b) Zn or Si? In each case…

A: Silver is a more ductile element than molybdenum. Ag has more valence electrons which makes the…

Q: What is the trend in the size of the band gap as you move down the column of the group 4A elements?

A: Band-In molecular orbitals of an atom the set of closely discrete energy levels is called as band.…

Q: If the density of solid chromium is 7.15 g/cm, what is the packing efficiency of Cr if it adopts a…

A: Given data:

Q: a) It is considered that a solid substance has an orthorhombic structure, Since the edges of the…

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Q: 4. About the surface energy; (a) The surface energy of a single crystal depends on the…

A: (a) Answer - According to the question - Given - The surface energy of a single crystal depends on…

Q: (a) In the cubic crystal structures, as the values of the Miller indices (h, k, and 1) increase,…

A: Miller indices are group of three values (hkl) that indicates the set of parallel planes of atoms in…

Q: Calculate the packing efficiency of a body-centered unit cell.

A: Bode centered unit cell (BCC)- BCC unit cell has atoms at each corner of unit cell and one atom at…

Q: Sodium metal with a bcc structure has two atoms per unit cell. The radius of the sodium atom is 1.85…

A: Mean free time = me/q2np  Here,  me is the effective mass of the conduction electrons  =…

Q: The second-order Bragg diffraction of X-rays with /l= 1.237 Å from a set of parallel planes in…

A: Given data contains, λ=1.237 A° 2θ=35.58° n=2 θ is calculated as, θ=35.58°2θ=17.79°

Q: How does the conversion of sunlight into into electric current occurs when light falls on a photo…

A: Electrical energy can be produced using solar energy.

Q: The band gap energy of semiconductor LED is 3.0ev What is the wavelength of maximum corresponding…

A: Wavelength can be calculated using the given equation: E =  hcλ

Q: In-band theory of bonding for solids, what is a bandgap? How does the bandgap differ in metals,…

A: The set of closely discrete energy levels of molecular orbitals is called band. Band that is…

Q: Cinnabar (HgS) was utilized as a pigment known as vermillion.It has a band gap of 2.20 eV near room…

A: Given , Band gap  = 2.20 eV           If E is the corresponding photon energy then,…

Q: The semiconductor CdSe has a band gap of 1.74 eV. Whatwavelength of light would be emitted from an…

A: The semiconductor CdSe has a band gap of 1.74 eV. The wavelength of light that would be emitted from…

Q: 1. Estimate at what temperature silicon tends to be as electrically conductive as diamond at room…

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Q: What is the meaning of magnetic susceptibility, orbital motion, ferromagnetism and…

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Q: How many molecular orbitals are present in the valence band of a sodium crystal with a mass of 5.45…

A: The number of sodium atom in a sodium crystal with a mass of 5.45 g is calculated as shown below.…

Q: A substance has a band gap of 0.85 eV at 273 K. Is this substance best classified as an insulator, a…

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Q: Use the band model to explain how it is possible for some materials to undergo a…

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Q: What type of semiconductor is obtained when silicon is doped with arsenic?

A: Silicon belongs to group 14. It has atomic number 14 and has 4 valence e-. Arsenic belongs to group…

Q: What is the energy gap in band theory? Compare its size in superconductors, conductors,…

A: The lower occupied molecular orbital is known as valence band and higher unoccupied molecular…

Q: In-band theory of bonding for solids, what is a bandgap? Howdoes the band gap differ in metals,…

A: Band gap refers to the distance between the valence band and conduction band. It represents the…