In a fcc arrangement of A and B atoms A are present at the corners of theunit cell and B are present at the face centres. If one atom of A is missingfrom its position at the corner, what is the formula of the compound?

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: The thermodynamically stable form of phosphorus under room conditionsis black phosphorus. Its unit…

A: Given information,       Orthorhombic unit cell with edges of lengths 3.314, 4.376, and 10.48 Å

Q: A compound orthorhombic cell has cell (a = 588, b = 820 and c = 796 pm). Find the density more…

A: This question deals with the density of an orthorhombic cell. The density of a unit cell is the…

Q: Calculate the planer density of planes (0:-1:-1) for BCC, and FCC crystal structures?

A:

Q: The unit cell of a compound containing Co and O has a unitcell shown below. The Co atoms are on the…

A: Since both the O atoms are completely inside the unit cell. Hence the contribution of both O to the…

Q: The electronic structure of a doped semiconductor isshown here. (a) Which band, A or B, is the…

A: Hey, since you are posted a question with multiple sub-parts, we will answer first three sub-parts.…

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: 2.3 The diagram below shows a cubic structure. Redraw the structure and identify point defects on…

A: The point defects in the given structure is,

Q: A particular form of cinnabar (HgS) adopts the zinc blendestructure. The length of the unit cell…

A:

Q: Two patterns of packing two different circles of the samesize are shown here. For each structure (a)…

A:

Q: Explain what happens when a pure semiconductor made up of Silicon is doped with an Indium atom…

A:

Q: Iron titanate, FeTiO3, forms in the ilmenite crystal structure that consists of an HCP arrangement…

A: (a)The formula unit of iron titanate can be written as FeO TiO2.Calculating the cation-to-anion…

Q: 17. Which of the following is not true for diamond structure? Each carbom atom is sp3 hybridised…

A: The incorrect statement about diamond has to be given,

Q: The cell parameters and lattice angles for the tetragonal a = 3.785 Å a = 90* %3D b = 3.785 Å B =…

A: Solution -

Q: Questión 4 Tungsten is BCC and has a lattice constant a of 0.31648 nm. Calculate the following…

A:

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: For the shown crystal structure, write down (a) the Bravais lattice and (b) the basis of the…

A: Given that, For this structure : a=b≠c & α=β=γ=90°.

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: Some hypothetical alloy is composed of 25 wt% of metal A and 75 wt% of metal B. If the densities of…

A: Given that : % wt of metal A in the alloy = 25% % wt of metal B in the alloy = 75% The density of…

Q: Two patterns of packing two different circles of the samesize are shown here. For each structure (a)…

A: The two-dimensional unit cells can be drawn as shown below:

Q: If you want to dope GaAs to make a p-type semiconductorwith an element to replace As, which…

A: A p-type semiconductor is a type of semiconductor. When the trivalent impurity is added to an…

Q: When you shine light of band gap energy or higher on asemiconductor and promote electrons from the…

A: The conductivity of semiconductor is possible due to the transfer of an electron from the valance…

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

A: see below

Q: =rystallographic planes for a unit cell of some ypothetical metal. The circles represent atoms. 0.30…

A:

Q: The electronic structure of a doped semiconductor isshown here. (a) Which band, A or B, is the…

A: The bands closest to the fermi level are valence band and conduction band. The electrical…

Q: Does a photon of red light with a frequency of 4.29 * 1014 Hzhave sufficient energy to promote an…

A: The electrons can be promoted to conduction band from the valence band if the band gap energy and…

Q: Which of the following structures is based on the cubic close-packing of cations?

A: Out the given compounds, CsCl is based on the cubic close-packing of cations. The Cs+ or Cl- ions…

Q: Has a compound orthorhombic unit cell (a=588, B=820, and C=796 pm). Find the density more precisely…

A: For orthorhombic unit cell the number z = 4 Density = z*M/a*b*c

Q: In the process of doping a semiconductor, certain impuri-ties are added to increase its electrical…

A: In semiconductors, the gap between the valence band (VB), and the conduction band (CB), is small.…

Q: If you want to dope GaAs to make an n-type semiconductorwith an element to replace Ga, which…

A: Compound semiconductors have an average of four electrons per atom that is total eight valence…

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: The unit cell of a compound containing Co and O has a unitcell shown below. The Co atoms are on the…

A: Since both the O atoms are completely inside the unit cell. Hence the contribution of both O to the…

Q: Two patterns of packing for two different circles of the samesize are shown here. For each structure…

A: Unit cell is the smallest repeating unit in a crystalline solid. If this unit is stacked over and…

Q: For each of the following pairs of semiconductors, whichone will have the larger band gap: (a) InP…

A: Since the band gap is directly proportional to the electronegativity difference of the atoms Hence…

Q: Compare the hybridization of Si atoms in Si(s) with thatof C atoms in graphite (see Fig. 21.26). If…

A: Both Si and C atoms has 4 valance electrons in its outer most shell and both of these form covalent…

Q: Q2. Calculate the planer density of planes (011) for BCC, and FCC crystal structures?

A: Planar density is defined as the number of atoms per unit area that is centered on a plane. So,…

Q: An ideal quantum dot for use in TVs does not contain anycadmium due to concerns about disposal. One…

A: Since the InP has the ZnS type structure, that is fcc, hence no. of ZnS in one unit cell will be 4…

Q: Explain face centered cubic unit cell in the simplest way possible and create an overview about it…

A: Face centered cubic unit cell: It is a Nonprimitive cubic unit cell.  In case of simple cubic unit…

Q: An increase in temperature causes most metals to undergothermal expansion, which means the volume of…

A: The volume (V) of the crystal is equal to the cube of edge length of the unit cell. Thus, if the…

Q: For each of the following pairs of semiconductors, whichone will have the larger band gap: (a) CdS…

A: Since the band gap is directly proportional to the electronegativity difference  Hence more the…

Q: Two patterns of packing for two different circles of the samesize are shown here. For each structure…

A: Unit cell is the smallest repeating unit in a crystalline solid. If this unit is stacked over and…

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…

Q: How does the band gap differ in metals, semiconductors, andinsulators?

A: Band gap is the energy gap between conduction band and valence band. In metals, the band gap between…