Question | Answer | % Correct |
---|---|---|
What do n-type semiconductors have more of? | Negative charge carriers | 88%
|
When an atom does not have a complete outer shell, it can form what kind of bonds with nearby atoms? | Covalent Bonds | 76%
|
A semiconductor's resistivity lies between that of an insulator and a conductor. As temperature rises in semiconductors, resistance _______. | Decreases | 76%
|
Ionic Bonds | 71%
| |
Semiconductors have almost filled valence bands. What are the two most common pure semiconductors? | Silicon | 71%
|
Compared to the current, what direction do free electrons roughly travel in a conducting metal lattice? | The opposite direction | 71%
|
What is the process of adding atoms with a different amount of valence electrons to a semiconductor? | Doping | 65%
|
Germanium | 65%
| |
What were early diodes and transistors made from? | Germanium | 59%
|
In semiconductors, what is the distance between the conduction and valence bands relative to insulators? | Small | 59%
|
What direction, relative to the conduction band's current, does this new positive current flow? | The opposite direction | 59%
|
What are the simplest form of a valves called? (They only have two electrodes) | Diodes | 53%
|
Opposite of the above require the addition of dopant atoms. What are these semiconductors called? | Extrinsic semiconductors | 53%
|
Silicon and Germanium do not need ^ to be a semiconductor. They are known as pure semiconductors. What is another name for them? | Intrinsic semiconductors | 53%
|
In an insulator, the valence band is full of electrons. Therefore the gap between the bands are _____. | Large | 53%
|
In a conductor, what do the conduction and valence bands do? | Overlap | 53%
|
What do p-type semiconductors have more of? | Positive charge carriers | 53%
|
What are integrated circuits in computer chips made of? | Silicon | 53%
|
Diodes can be made with semiconductors. In diodes, electrons travel away from what type of semiconductor? | N-type Semiconductors | 47%
|
What are the two most common dopant atoms? (one each for n-type and p-type) | Phosphorus | 47%
|
What is the highest band occupied by electrons called? | The valence band | 47%
|
Boron | 35%
| |
What word descibes the free movement of electrons in a metal lattice? | Delocalised | 35%
|
What do the electrons leave behind in the valence band? | Positive hole | 35%
|
It can also convert alternating current (AC) into direct current (DC). What is this called? | Rectification | 35%
|
To get to the other semiconductor, which is the other type, what zone do the electrons travel across? | The depletion zone | 35%
|
By being more reliable and allowing for miniturisation, transistors replaced which device in electronic devices? | Thermionic valves | 35%
|
No two electrons in an atom can simultaneously occupy ___ ____ ______ _____. | The same energy state | 35%
|
Due to its simplicity, ^'s unidirectional current means it is used for what simple function? | A switch | 29%
|
Can be used in smaller devices | 29%
| |
Lee de Forest added what to convert the simple valve into a current amplifier, or triode? | Another electrode | 24%
|
As temperature increases, what does thermal energy allow electrons in the valence band to do? | Cross the gap | 24%
|
What do thermionic devices use in glass vacuum tubes to control the flow of current. | Heated filaments | 24%
|
What are ionically bonded molecules? | Insulators | 24%
|
Solid state devices encompass transistors and what other device? | Integrated circuits | 24%
|
Npn transistors | 24%
| |
Transistors are semiconductor devices that can act as a switch or as an amplifier. What are the two main types of transistor? | Pnp transistors | 24%
|
What did de Broglie proposed that electrons could also be considered as? | Standing waves | 24%
|
What are the main benefits of solid state devices over thermionic devices? | They are smaller | 24%
|
Affected less by higher temperatures | 18%
| |
Less fragile | 18%
| |
Less heat produced | 18%
| |
Longer lifetime | 18%
| |
Lower voltage required | 18%
| |
More reliable | 18%
| |
What shape do groups of silicon atoms form in a diamond lattice structure? | Tetrahedrons | 18%
|
What is a transistor is a combination of? | two n-p junctions | 18%
|
Integrated circuits are tiny electrical circuits used to perform specific electrical functions. What primarily is the issue with wiring that IC's reduce? | Variable resistance | 18%
|
What were the main advantages of silicon solid state devices? | Very common in the Earth's crust | 18%
|
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