GaAs is a compound semiconductor commonly used for LEDs. Talk about the chemical bonds and crystal structures of GaAs crystals and explain why they become semiconductors, not metal alloys (consider the electronic structure of each atom and sp3 hybrid orbit).

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: Which statement correctly describes a difference betweengraphene and graphite?(a) Graphene is a…

A: a. Is statement is wrong because graphene is not a molecule  b. This statement stands right because…

Q: Use the figure of band structures to explain why the conductivity of pure metals decreases when…

A:

Q: Which of the following group 14 (Ciroup IV) elernent/compounds have giant govalent lattices? I SiO:…

A: The electropositivity of the  elements down the group increases and the tendency to form ionic bond…

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: Account for the relative bandgap energies of semiconductors interms of periodic trends?

A: Semiconductors are materials which have a conductivity between conductors (generally metals) and…

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

A:

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: Two solids are shown below. One is a semiconductor andone is an insulator. Which one is which?…

A:

Q: How Band theory differentiate between semiconductors and semi materials?

A:

Q: sketch 2D network structure of amorphous B2O3

A: Borate glass: B2O3: the glass former consisting of corner -sharing BO3 triangles connected by bridge…

Q: Diffusion does not have an effect on______. a) Doping in semiconductors b) Production of alloys c)…

A: Diffusion doesn't not have an effect on heat treatment of metals .  In production of alloy the metal…

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

A:

Q: Distinguish  between the bond thos exist  In CsCl and SiC Crystals.

A: Chemical Bond: Chemical bonds are type of forces which hold two or more than two atoms to form a…

Q: >List three allotropes of crystalline carbon.

A: An element that can exist in two or more different forms is known as allotropes. Allotropes are of…

Q: Use the hybridization and structures of graphite and diamond to explain why graphite conducts…

A: The objective of the question is to explain the reason behind the good electrical conductivity of…

Q: Describe the bonding in calcium oxide, CaO, in terms of bands composed of Ca and O atomic orbitals.…

A: SOLUTION: Step 1: The Calcium ion is an Alkaline earth metal and give up the 2s orbital electrons…

Q: How does the doping increase the conductivity of semiconductors?

A: Conductivity of semiconductors:When a certain amount of suitable impurity or doping is added, the…

Q: Which groups of elements have the best and which the poorest electrical conductivities? Explain.

A: For an element to conduct electricity, it must have free electron to move around.

Q: Calculate the number of molecular orbitals present in the valence band of a lithium crystal with a…

A: Given: Mass of lithium crystal = 2.52 g And we know that the molar mass of lithium = 6.941 g/mol

Q: se molecular orbital band diagrams to explain why metals are good conductors but semiconductors are…

A: Introduction: We have to explain metals are good conductors but semiconductors are not. Molecular…

Q: 30. Use the hybridizations and structures of graphite and diamond to explain why graphite conducts…

A: If Sp2 hybridization present then compound is planer ..if sp3 hybridization present then compound is…

Q: For each of the following pairs of semiconductors, pick which one would have the larger bandgap.…

A: SEMICONDUCTORS: Certain materials which has a conductivity which lies between nonconductors and…

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: Why does graphite conduct electricity?

A: Graphite is an allotrope of carbon. It is a covalent solid. It has a trigonal planar geometry. The…

Q: why Intrinsic Semiconductor materials are the bad conductors of electricity

A: Semiconductor is actually a type of material which has  conductivity in between the conductor and…

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: What is the arrangement of the Ca2+ ions (white spheres)? A BCC в) FCC HCP D sc

A: Arrangement of the Ca2+ ions (white sphere) = ?

Q: Which substance do you expect to have the greatest latticeenergy: MgF2, CaF2, or ZrO2?

A: The lattice energy of the system depends upon the charge on cation and anion. Also, the lattice…

Q: How are metals used as semiconductors refined? What is the principle of the method used?

A: The metallic compounds which are found in nature, called as minerals whereas the minerals which can…

Q: ) Explain the band structure of an electrical conductor (metal), a semiconductor, and an insulator…

A: Hello. Since your question has multiple parts, we will solve the first question for you. If you want…

Q: LiH crystallizes with the same structure as NaCl. Given the ionic radii and the molar mass of Li+ (…

A:

Q: 3) What is the difference in energy between the valence band and conduction band of electrical…

A: Conduction band is the empty band whereas valence band is the filled electronic band. Valence band…

Q: Calculate the radius of palladium atom in nm, given that Pd has an FCC crystal structure, a density…

A:

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: Why is graphite soft lubricant and good conductor of electricity?

A: Graphite is a non metal having two dimensional sheet like structure where each carbon atom uses sp2…

Q: the theoretical density in g/cm^3

A: The required solution is as follows:

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: Carbon and silicon belong to the same group of the periodic table. Describe and compare three…

A: Carbon and Silicon both elements belong to the same group that is group 14(4A). They contain same…

Q: Are allotropes different from polymorphs with respect to Carbon? Give reason for your answer.

A: Polymorphism is similarly defined as isomerism, it means if structure of an ionic compound exist in…

Q: Nomex, a condensation copolymer used by firefighters because of its flame-resistant properties,…

A: The given compound is Nomex.

Q: Why is graphene unique?

A: Graphene is an allotrope of carbon. The carbon atoms in the graphene structure are present in a…