True False____________Electrical insulators such as SiO_2 are characterized by a

Question

True False____________Electrical insulators such as SiO_2 are characterized by a very large energy gap.____________Silicon (Si) is an example of a compound semiconductor____________The number of free elections in an intrinsic semiconductor increases with increasing temperature____________The electric resistivity of metals increases with increasing temperature____________Copolymer is a polymeric material whose chains contain just a single type of mer units.____________The electric conductivity of a material is the reciprocal of its electric resistance.____________The solubility of C is higher in alpha-Fe (bcc) than in gamma-Fe (fcc)____________Two oppositely charged ion vacancies in crystalline ceramics are known as Frenkel defects.____________In carbon steels water quenching from the austenite temperature promotes the formation of pearlite.____________In crystalline ceramics, impurities typically reduce the number of point defects.____________The magnitude of the hole mobility in semiconductors is significantly higher than the electron mobility.____________Extrinsic p type semiconductors are doped using group V impurities

Explanation / Answer

1) Electrical insulators suds as SiO2: are characterized by very large energy gap—true

SiO2:-9ev energy gap

In strong state material science, a band hole, likewise called a vitality crevice or bandgap, is a vitality range in a strong where no electron states can exist. In charts of the electronic band structure of solids, the band hole for the most part alludes to the vitality distinction (in electron volts) between the highest point of the valence band and the base of the conduction band in encasings and semiconductors. It is firmly identified with the HOMO/LUMO hole in science. In the event that the valence band is totally full and the conduction band is totally void, then electrons can't move in the strong; nonetheless, on the off chance that a few electrons exchange from the valence to the conduction band, then current can stream (see transporter era and recombination). In this way, the band crevice is a main consideration deciding the electrical conductivity of a strong. Substances with vast band holes are for the most part covers, those with littler band crevices are semiconductors, while directors either have little band holes or none, on the grounds that the valence and conduction groups cover.

2 Silicon is example of compound semiconductor—true

Silicon is a synthetic component with image Si and nuclear number 14. It is a tetravalent metalloid, .... Since silicon is a vital component in high-innovation semiconductor gadgets, numerous spots on the planet bear its name.

(3) The number of free electrons in an intrinsic semiconductor increases with increasing temperature—true

(4) The electric resistivity of metals increasing with increasing temperature-false

5. copolymer is polymeric material whose chains contains just a single type of met units-true

(6) The electric conduct it of a material is the reciprocal of its electric resistance. _ true

(7) The solubility of C is higher in alpha-Fe (bce) than in gamma.-Fe (fce.)------false

BCC ferrite ------ stable

(8) Two oppositely charged ion vacancies in crystalline ceramics are knout as frenkel defects. ------- true

The Frenkel Defect (otherwise called the Frenkel pair/issue) is an imperfection in the grid precious stone where an iota or particle involves a regularly empty site other than its own. Thus the iota or particle leaves its own particular cross section site empty

_ (9) In carbon steels water quenching from the austensite temperature promotes the formation of pearlite. -TRUE

(10) In crystalline ceramics, impurities typically reduce the number of point defects---------FALSE.

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