Don't answer this electrical question if you don't know the answer, and thank you?

Semiconductors are very similar to insulators. The two categories of solids differ primarily in that insulators have larger band gaps — energies that electrons must acquire to be free to flow. In semiconductors at room temperature, just as in insulators, very few electrons gain enough thermal energy to leap the band gap, which is necessary for conduction. For this reason, pure semiconductors and insulators, in the absence of applied fields, have roughly similar electrical properties. The smaller bandgaps of semiconductors, however, allow for many other means besides temperature to control their electrical properties.

Semiconductors' intrinsic electrical properties are very often permanently modified by introducing impurities, in a process known as doping. Usually it is reasonable to approximate that each impurity atom adds one electron or one "hole" (a concept to be discussed later) that may flow freely. Upon the addition of a sufficiently large proportion of dopants, semiconductors conduct electricity nearly as well as metals. Depending on kind of the impurity, a region of semiconductor can have more electrons or holes, and then it is called N-type or P-type semiconductor, respectively. Junctions between regions of N- and P-type semiconductors have built-in electric fields, which cause electrons and holes to escape from them, and are critical to semiconductor device operation. Also, a density difference of impurities produces in the region small electric field which is used to accelerate non-equilibrium electrons or holes in it.

It took me less time to answer this question than it did for you to ask it. Just curious.. why didn't you just look it up?

The answer is B.

Transistors, diodes, integrated circuits Complex Programmable Logic Devices (CPLD), and Application Specific Integrated Circuits (ASIC) are the most common examples of modern day semiconductors. Pocket calculators, computers, digital watches, video games, DVDs, and cell phones have been developed due to semiconductor technology. Trying to imagine a world without these gadgets made possible with semiconductors is like trying to imagine a world without the automobile.

It replaced right into a wonder - yet do not trouble. No harm. occurs fairly usually to human beings. Many electricians will "try" wires via deliberately touching them with one finger and sense the wonder before really grabbing them and dealing with them. no longer the finest element to do, yet proves that's harmless. (be conscious: Grabbing an electric powered circuit may reason your muscular tissues to settlement the position you could't enable go and that can do severe harm - so do not grab wires you don't know in the journey that they are lively or no longer).

B is the answer. choices a and c are not even close

Answer is B.

B