WHICH ONE OF THE FOLLOWING STATEMENTS BEST EXPLAINS WHY SEMICONDUCTORS IN TRANSISTORS ARE DOPED?

A) doping converts the semiconducting material into a metallic material like copper.
b) doping makes the charge carriers mobile.
c) doping makes the charge carriers immobile.
d) doping changes the conductive properties of the semiconductors.
e doping makes the semiconducting material non-conducting.

well, the question is whether b or d is the"best explaination".

I vote for d.

http://en.wikipedia.org/wiki/Semiconductor#Doping

The correct answer is B) doping makes the charge carriers mobile.

Doping is the process of intentionally introducing impurities into a semiconducting material. These impurities are selected to have different electron configurations than the atoms of the semiconductor material. By introducing impurities, the number of electrons or "charge carriers" in the material can be increased or decreased.

When these impurities are added to the semiconducting material, they either donate or accept extra electrons, creating an excess of either negative or positive charge carriers. This process is called n-type and p-type doping, respectively.

In n-type doping, elements with more valence electrons than the semiconductor material, such as phosphorus or arsenic, are added. These impurities donate electrons, creating an excess of negative charge carriers or electrons. This increases the conductivity of the semiconductor.

In p-type doping, elements with fewer valence electrons than the semiconductor material, such as boron or gallium, are added. These impurities accept electrons, creating a deficit of electrons or "holes." This increases the conductivity of the semiconductor.

So, the main purpose of doping in transistors is to make the charge carriers mobile, allowing for the control and manipulation of electric current in the device.

To determine the correct answer, let's analyze each option and find the most accurate one:

A) Doping converts the semiconducting material into a metallic material like copper: This statement is incorrect. Doping does not convert semiconductors into metals. Doping alters the conductive properties of semiconductors, but it does not change them into metals.

B) Doping makes the charge carriers mobile: This statement is correct. Doping introduces impurities into the semiconductor material, which creates additional charge carriers (either electrons or holes) in the semiconductor. These additional charge carriers increase the mobility of charge and improve the conductivity of the semiconductor material.

C) Doping makes the charge carriers immobile: This statement is incorrect. Doping actually increases the mobility of charge carriers, as mentioned in the previous statement.

D) Doping changes the conductive properties of the semiconductors: This statement is correct. Doping alters the conductive properties of semiconductors by introducing impurities into the material. This modification of the material's properties allows it to function as a transistor.

E) Doping makes the semiconducting material non-conducting: This statement is incorrect. Doping increases the conductivity of the semiconducting material. Without doping, the pure semiconductor material would not be conductive.

Therefore, the correct answer is D) doping changes the conductive properties of the semiconductors.