Does a photon of red light with a frequency of 4.29 * 10  14 Hz have sufficient energy to promote an electron from the valence band to the conduction band in a sample of silicon (the band gap in silicon is 1.11 eV)?

Q: (a) What change occurs when AgCl is doped with CdCl2?(b) What type of semiconductor is produced when…

A: The small gap in valance band and conduction band in semiconductors lead to jumping of electrons…

Q: 2. How many octahedral and tetrahedral holes are there in CCP and HCP unit cells?

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Q: Show that the radius of the largest sphere that can be placed in a tetrahedral interstitial site in…

A: Consider a crystal lattice of edge length ‘a’ with the sphere present in fcc arrangement (corners +…

Q: The electronic structure of a doped semiconductor is shown here.  1.)Is this an example of an…

A: Semiconductors can be defined as the materials whose conductivity lie between metals and insulators.

Q: The compounds K2O, ZnS, and ZrI4 all can be described as cubic closest packed anions with the…

A: Anions are larger in size than cations in an ionic solid. So, anions constitute the lattice and…

Q: What type of bonding would you expect in Silicon nitride? explain the answer and what kind of…

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Q: In the process of doping a semiconductor, certain impurities are added to increase the electrical…

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Q: GaP and GaAs are both used in LED (light-emitting diode) applications. i.The bandgap of GaP is 2.26…

A: We have the basic formula, Energy(∆E) = hcλ Here, given, Energy = 2.26 eV (GaP) and 1.43 eV (GaAs)

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

A: Step : 1               Calculate the density.

Q: Draw the following directions or planes in a single unit cell. (a.) [010] , (b.) (220) , (c.) (111),…

A: crystals are made of infinite no of unit cells.unit cell is smallest unit of crystals if repeated…

Q: (a)What are intrinsic semiconductors? Give an example.(b) What is the distance between Na+and Cl–…

A: Semiconductors are those substances which have conductivities in between the metals and nonmetals.…

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: 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: What is a, the unit cell length, in nm, for aluminum? a = i nm

A: We have to find out the edge length "a" for the unit cell of aluminium.,

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: Show how the cesium chloride, sodium chloride, and zinc blende unit cells each contain a…

A: In the cesium chloride unit cell, one chlorine ion is present at each corner of the unit cell. Since…

Q: Predict the effect (if any) of a decrease in temperature on the electrical conductivity of (a)…

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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: What is the minimum number of atoms that could be containedin the unit cell of an element with a…

A: Since we have atoms present at corners and face centres of cube in fcc as  1) 8 atoms on each of the…

Q: In the following unit cell, which vector represents the [121] direction? B. +y OD B O A -/2

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Q: Q.4. A certain compound is observed to give peaks in the XRD pattern at 20 values of 42.2, 49.2,…

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Q: A solid sample of strontium contains 2.27x1021 FCC unit cells. Determine the volume of the solid…

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Q: Within a cubic unit cell, sketch the following directions and planes: (a) [1 10] (d) (011) (b) [1 2…

A: Note - Since you have posted a question with multiple sub-parts, we will solve first three sub-parts…

Q: Unit cell) calculate atomic radius in picometers; not sure how to get volume or side length if I…

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Q: Which of the following doped semiconductors will be p-type and which will be n-type (i)Arsenic in…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Describe the caesium-chloride and rock-salt structures. How does the radius-ratio rule help in the…

A: The below is the structure of cesium chloride.

Q: In terms of band theory, what is the difference(i) between a conductor and a semiconductor?(ii)…

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Q: If the density of solid tungsten is 19.3 g/cm319.3 g/cm3, what is the packing efficiency of WW if it…

A: Given, The packing efficiency is calculated by the formula shown below.

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

A: The solution is provided in the image below.

Q: 5. Draw the plane in the unit cell, given the following Miller Indices of the plane. Indicate the…

A: (3,-1,2) Miller indices has intercepts on (a3, -b, c2). The origin is represented as O.

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

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Q: greatest wavelength

A: wavelength(nm) =  1240.8 / Energy(ev)   wavelength = 1240.8 / 2.4                      = 517 nm

Q: An element with density 2.8 g cm-3 forms a fee unit cell with edge length 4 X 10-8 cm. Calculate the…

A: Given data, Density (d) = 2.8 g cm-3 edge length (a) = 4 × 10-8 cm NA = 6.022 × 1023 mol-1 FCC unit…

Q: Explain how doping can increase the conductivity of a semiconductor.

A: Conductivity is due to the mobility of electrons; therefore, conductivity can be increased by…

Q: 5. Cadmium sulfide, CdS, is used as a photoconductor in light meters. The band gap is about 2.4 eV.…

A: Conduction band is collection of electronic orbital which an electron can occupy after some energy…

Q: Is gallium-doped germanium a p-type or n-type semiconductor?

A: Gallium-doped germanium is a p-type semiconductor.

Q: If the density of solid chromium is 7.15 g/cm37.15 g/cm3, what is the packing efficiency of CrCr if…

A: Given, Density of solid chromium =7.15 gcm3 molar mass of solid chromium = 51.996 gmol

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: Define the term Semiconductor Type? Which element would you dope into germanium to create a p-type…

A: Conductor: Conductors are materials that allow flowing of heat and electricity through them due to…

Q: Which of the following schemes for the repeating pattern of close-packed planes are ways of…

A: if the conjugative layers are different then the packing efficiency is high and generated the closed…