# Statistics for Transistors and Semiconductors

### General Stats

• This quiz has been taken 27 times
• The average score is 18 of 49

What do n-type semiconductors have more of?Negative charge carriers
84%
When an atom does not have a complete outer shell, it can form what kind of bonds with nearby atoms?Covalent Bonds
74%
A semiconductor's resistivity lies between that of an insulator and a conductor. As temperature rises in semiconductors, resistance _______.Decreases
74%
Ionic Bonds
68%
Semiconductors have almost filled valence bands. What are the two most common pure semiconductors?Silicon
63%
Compared to the current, what direction do free electrons roughly travel in a conducting metal lattice?The opposite direction
63%
What is the process of adding atoms with a different amount of valence electrons to a semiconductor?Doping
58%
Germanium
58%
What were early diodes and transistors made from?Germanium
53%
What do p-type semiconductors have more of?Positive charge carriers
53%
In semiconductors, what is the distance between the conduction and valence bands relative to insulators?Small
53%
What direction, relative to the conduction band's current, does this new positive current flow?The opposite direction
53%
What are the simplest form of a valves called? (They only have two electrodes)Diodes
47%
Opposite of the above require the addition of dopant atoms. What are these semiconductors called?Extrinsic semiconductors
47%
Silicon and Germanium do not need ^ to be a semiconductor. They are known as pure semiconductors. What is another name for them?Intrinsic semiconductors
47%
In an insulator, the valence band is full of electrons. Therefore the gap between the bands are _____.Large
47%
In a conductor, what do the conduction and valence bands do?Overlap
47%
What are integrated circuits in computer chips made of?Silicon
47%
What is the highest band occupied by electrons called?The valence band
47%
Diodes can be made with semiconductors. In diodes, electrons travel away from what type of semiconductor?N-type Semiconductors
42%
What are the two most common dopant atoms? (one each for n-type and p-type)Phosphorus
42%
Boron
32%
What word descibes the free movement of electrons in a metal lattice?Delocalised
32%
What do the electrons leave behind in the valence band?Positive hole
32%
It can also convert alternating current (AC) into direct current (DC). What is this called?Rectification
32%
To get to the other semiconductor, which is the other type, what zone do the electrons travel across?The depletion zone
32%
By being more reliable and allowing for miniturisation, transistors replaced which device in electronic devices?Thermionic valves
32%
No two electrons in an atom can simultaneously occupy ___ ____ ______ _____.The same energy state
32%
Due to its simplicity, ^'s unidirectional current means it is used for what simple function?A switch
26%
Can be used in smaller devices
26%
Lee de Forest added what to convert the simple valve into a current amplifier, or triode?Another electrode
21%
As temperature increases, what does thermal energy allow electrons in the valence band to do?Cross the gap
21%
What do thermionic devices use in glass vacuum tubes to control the flow of current.Heated filaments
21%
What are ionically bonded molecules?Insulators
21%
Solid state devices encompass transistors and what other device?Integrated circuits
21%
Npn transistors
21%
Transistors are semiconductor devices that can act as a switch or as an amplifier. What are the two main types of transistor?Pnp transistors
21%
What did de Broglie proposed that electrons could also be considered as?Standing waves
21%
What are the main benefits of solid state devices over thermionic devices?They are smaller
21%
Affected less by higher temperatures
16%
Less fragile
16%
Less heat produced
16%
16%
Lower voltage required
16%
More reliable
16%
What shape do groups of silicon atoms form in a diamond lattice structure?Tetrahedrons
16%
What is a transistor is a combination of?two n-p junctions
16%
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
16%
What were the main advantages of silicon solid state devices?Very common in the Earth's crust
16%