A doped semiconductor has impurity levels `30meV` below the conduction band. Is the material `n`-type or `p`- type? Find the maximum wavelength of ight so that an electron of impurity level is just able to jump to into conduction band.
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(a) What change occurs when AgCl is doped with `CdCl_(2)` ? (b) What type of semiconductor is produced when silicon is doped with boron?
(a) `CdCl_(2)` on adding to AgCl introduces impurity defect. The addition of one `Cd^(2+)` ion will replace two `Ag^(+)` ions to maintain electrical conductivity. One of the position of `Ag^(+)`...
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An X-ray tube has nickel as target. The wavelength difference between the ka X-ray and the cut-off wavelength of continuous X-ray spectrum is 84 pm. F
Correct Answer - `14.8 kV`
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A material core has 10 turns per cm of wire wound uniformly upon it which carries a current of 2.0 A. The flux density in the material is 1.0 `WB m^(-
Correct Answer - 2000 turns `m^(-1) , 7.9 xx 10^(5) "A turns" m^(-1), 397`
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The bank gap of an alloy semiconductor galiumarseide phosphie is `1.98eV`. Calculate the wavelength of radiation that is emitted when electrons and ho
Correct Answer - `6250Å,` red
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Germanium is doped one part million with indium at room temperature. Calculate the conductivity of doped germanium. Given: concentration of Ge atoms `
Correct Answer - `1.34xx10^(3)ohm^(-1)m^(-1)`
2 Answers 2 views
The resistivity of pure germanium at a particular temperature is `0.52Omegam`. If the material is doped with `10^(20)` atoms `m^(-3)` of a trivalent i
Correct Answer - `0.195Omegam`
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a 0.02 m wide slit is illumijnated at normal incidence by light of wavelength 6000 Å (i) Find the width of the central maximum band on the screen plac
Correct Answer - (i)0.6 cm (ii) 0.45 cm
2 Answers 2 views
Electric conduction through a semiconductor is due to
Correct answer is (D) both electrons and holes
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Which element would you use as an impurity to make germanium an n-type semiconductor?
Germanium can be made an n-type semiconductor by doping it with pentavalent impurity, like phosphorus (P), arsenic (As) or antimony (Sb).
2 Answers 1 views
Why is the conductivity of a n-type semiconductor greater than that of p-type semiconductor
1. In a p-type semiconductor, holes are majority charge carriers. 2. When a p-type semiconductor is connected to terminals of a battery, holes, which are not actual charges, behave like a...
2 Answers 2 views