ECE :: Materials and Components
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Silicon and germanium are elements in the
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A sample of N type semiconductor has an electron density of 6.25 x 1018/cm3 at 300 K. If intrinsic concentration of carriers in this sample is 2.5 x 1013/cm3 at this temperature, the hole density is
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Assertion (A): In a conductor, current density remains constant in time as long as E is constant.
Reason (R): In a conductor, J = σE.
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A specimen of metal has n valence electrons per m3. If vx is the average velocity of these electrons, each having a charge e, the current density J is
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Which of the following is used in temperature alarm circuits?
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A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component vx is x direction. Then
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n type semiconductors
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The most important primary force of attraction in the formation of solids is
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