ssrs code 39

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Electric conduction may be explained by the band theory of solids In solids, the allowed energy levels for outer electrons in an atom are spread into broad bands by the electric fields of electrons on neighboring atoms The valence and conduction bands are separated by forbidden energy gaps; that is, by regions of energy levels that electrons may not possess In conductors, electrons can move through the solid because the conduction band is partially filled Electrons in metals have a fast random motion A potential difference across the metal causes a slow drift of electrons, called an electric current In insulators, more energy is needed to move electrons into the conduction band than is generally available Conduction in semiconductors is enhanced by doping pure crystals with small amounts of other kinds of atoms, called dopants n-type semiconductors are doped with electron donor atoms, and they conduct by the response of these donor electrons to applied potential differences Arsenic, with five valence electrons, is an example of a donor atom p-type semiconductors are doped with electron acceptor atoms, and they conduct by making holes available to electrons in the conduction band Gallium, with three valence electrons, is an example of an acceptor atom

// draw the control points if (draggingCp1) { [self drawControlPointAtX:cp2X [self drawControlPointAtX:cp1X } else { [self drawControlPointAtX:cp1X [self drawControlPointAtX:cp2X }

diode (p 784) depletion layer (p 784) transistor (p 787) microchip (p 788)

C:\Documents and Settings\RICH>echo %APPDATA% C:\Documents and Settings\RICH\Application Data C:\Documents and Settings\RICH>

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A pn-junction diode consists of a layer of a p-type semiconductor joined with a layer of an n-type semiconductor Diodes conduct charges in one direction only They can be used in rectifier circuits to convert AC to DC Electrons and holes near either side of the diode junction combine to produce a region without charge carriers known as the depletion layer Applying a potential difference of the proper polarity across the diode makes the depletion layer even wider, no current is observed, and the diode is said to be reverse-biased Reversing the polarity of the applied potential across the diode greatly reduces the depletion layer, current is observed, and the diode is said to be forward-biased A transistor is a sandwich of three layers of semiconductor material, configured as either npn- or pnp-layers The center base layer is very thin compared to the other layers, the emitter and collector A transistor can act as an amplifier to convert a weak signal into a much stronger one The ratio of the collector-emitter current to the base current is known as the current gain and is a useful measure of transistor amplification Conductivity of semiconductors increases with increasing temperature or illumination, making them useful as thermometers or light meters Diodes that emit light when a potential is applied are used in optical devices

41 For the energy-band diagrams shown in Figure 29-16,

42 For the energy-band diagrams shown in Figure 29-16,

better insulator: one with a forbidden gap 8-eV wide, one with a forbidden gap 3-eV wide, or one with no forbidden gap

differ from the energy levels in a single atom of that element (291)

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its conductivity (291)

semiconductor (291)

potential difference across a device to be tested, measures the current, and displays the resistance of the device If you connect an ohmmeter across a diode, will the current you measure depend on which end of the diode was connected to the positive terminal of the ohmmeter Explain (292)

Figure 29-17

emitter in a transistor circuit symbol (292)

That s it! Build & Run, and you ll see that whenever you re dragging the first control point, it appears in front of the second. It would also be nice to highlight the control point that s currently being dragged, maybe by drawing it with a different color. This is also a pretty easy change that gives the user

39 Describe the structure of a forward-biased diode,

and explain how it works (292)

Figure 29-18

40 For the energy-band diagrams shown in Figure 29-16,

following elements could be added to germanium to make a p-type semiconductor: B, C, N, P, Si, Al, Ge, Ga, As, In, Sn, or Sb

To display the value of the environment variable, place percent signs (%) around it within the echo statement Now that you know the value of the APPDATA environment variable, the psqlrcconf file is located in the following path:

resistance, is the ohmmeter lead on the arrow side of the diode at a higher or lower potential than the lead connected to the other side

some useful feedback. Start by defining some highlight colors for a new gradient, adding these lines among the other #defines at the top of the file:

51 If you dope pure germanium with gallium alone,

Figure 29-16

shown in Figure 29-10, is connected to a battery through a 270- resistor The battery forward-biases the diode, and the diode current is 15 mA What is the battery voltage

Figure 29-19

of sodium Its density is 0971 g/cm3, its atomic mass is 2299 g/mol, and there is 1 free electron per atom

#define CP_GRADIENT_HIGHLIGHT_COLOR1 [NSColor whiteColor] #define CP_GRADIENT_HIGHLIGHT_COLOR2 [NSColor redColor]

Figure 29-21

on, and that there is a 070-V drop across the baseemitter junction and a current gain from base to collector of 220 a Determine the base current b Determine the collector current c Determine the voltmeter reading

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