1which is a dopant for a p-type semiconductor?

arsenic
indium
phosphorus
antimony

2which statement is true for both types of transistors?

current flows from the collector to the emitter.
current flows from the base to the emitter.
the base is between the collector and the emitter.
the base is a p-type semiconductor.

3 which explains whether boron or arsenic is the dopant most likely used in the semiconductor layer marked with +?

this layer is the controller of an npn transistor, so it could include boron.
this layer is the emitter of an npn transistor, so it could include arsenic.
this layer is the controller of a pnp transistor, so it could include arsenic.
this layer is the emitter of a pnp transistor, so it could include boron.

4 what can a transistor do in order to fulfill its function in a circuit? check all that apply.

control which layer is the emitter
control its own semiconductance
change the dopants in the transistor
act like an insulator
act like a conductor

5which lists the layers in a pnp transistor from the least negative to the most negative?

emitter, base, collector
base, emitter, collector
collector, base, emitter
collector, emitter, base

6roland writes a story in which boaters become stranded on a sandy island. in the story, they set about collecting materials to create semiconductors to repair computer components in their radio.

which problem is likely to be the most difficult for roland’s characters to overcome?

there are no semiconductor elements on the island.
any substances they find are too impure.
they lack materials to make a p-type semiconductor.
no conductors are available to connect the components.

For a p type of semiconductor we need a dopant which is from 13th group in periodic table

Al , B, Ga, In Tl

So the correct element will be In : Indium

The other elements belongs to 15th group and hence will give n type semiconductor

Arsenic is dopant for P type semiconductor

Doping means the addition of impurities to a semiconductor. It can be of two types. N type doping and P type doping. The P stands for Positive, which means the semiconductor is rich in holes or Positive charged ions. Similarly N stands for negative and it is rich in electrons.  The addition of trivalent impurities such as boron, aluminum or gallium to an intrinsic semiconductor creates deficiencies of valence electrons, called "holes". Since arsenic is trivalent so it is a dopant to p type semiconductor

The base is between the collector and the emitter.

A transistor is an electronic component that can be used as an amplifier, or as a switch. A transistor has three connectors or terminals which are the collector, the emitter, and the base. The flow of charge goes in the collector, and out of the emitter, depending on the charge flowing to the base. Base is present between collector and emitter. If it is a PNP transistor then the emitter and collector are both a p-type semiconductor material and the base is n-type and vice versa for an NPN transistor.

The right option is This layer is the emitter of a PNP transistor, so it could include boron.

In PNP transistor, the voltage between the Base and Emitter is negative at the Base and positive at the Emitter and hence the Base terminal is always biased negative with respect to the Emitter.  The polarities of the current and voltage directions are reversed for any one of the possible three configurations such as Common Base, Common Emitter and Common Collector. Boron will act like trivalent having -3 valency so we can say that this layer is the emitter of a PNP transistor, so it could include boron.

the correct options are

As we know that a transistor is a current driven semiconductor device which can be used to control the flow of electric current in which a small amount of current in the Base lead controls a larger current between the Collector and Emitter so we can say that it acts like a conductor or it acts like a switch. Any Transistor conducts current across the collector-emitter path only when a voltage is applied to the base. When no base voltage is present, the switch is off. When base voltage is present, the switch is on. Similarly it also control its own semi conductance which means it amplifies its signal. This happens because the controlled output power can be higher than the controlling input power inside transistor.

The right option is base, emitter,collector

For a PNP transistor holes are the more important carriers, whereas electrons are the important carriers for NPN transistors. Regarding the collector in PNP, it wont give current to the emitter unless the emitter is more more positive than the base. PNP transistors use a small base current and a negative base voltage to control a much larger emitter-collector current. In other words for a PNP transistor, the Emitter is more positive with respect to the Base and also with respect to the Collector.

No conductors are available to connect the components.

Since they set about collecting materials to create semiconductors to repair computer components in their radio, they can make semiconductors form sand because sand contains silica and quartz, both of them are used to manufacture semiconductors on large scale. But the connections requires wires and wires are made up of copper or any other soft metal. On integrated scale IC can be produce from and but since they are creating radio on bigger scale so they require soft metals like copper for connecting their devices.