Lecture 1

Question 1

Made of a semiconductive material.

Answer 1

Diodes, transistors, and integrated circuits (IC)

Question 2

Formed when two different types of semiconductive material are joined.

Answer 2

PN junction

Question 3

The science that deals with the development and application of devices and systems involving the flow of electrons in vacuum, in gaseous media, plasma and in semiconductors.

Answer 3

RA 5734, Sec. 21 C

Question 3

The science dealing with the development and application of devices and systems involving the flow of electrons or other carriers of electric charge, in a vacuum, in gaseous media, in plasma, in semiconductors, in solid-state and/or in similar devices, including, but not limited to, applications involving optical, electromagnetic and other energy forms when transduced or converted into electronic signals.

Answer 3

RA 9292, Sec. 3 H

Question 4

Introduced by Thomas Edison and John Ambrose Fleming in 1904.

Answer 4

Two-electrode vacuum tube

Question 5

Inventor of the first practical incandescent light bulb.

Answer 5

Thomas Alva Edison

Question 6

Commercial TV began

Answer 6

1946

Question 7

First vacuum tube computer was built at the University of Pennsylvania.

Answer 7

1943

Question 8

Introduction of point-contact transistor by Walter H. Brattain and John Bardeen at Bell Telephone Laboratories.

Answer 8

December 23, 1947

Question 9

Complex combination of several kinds of devices on a common base, called substrate. Invented by Jack Kilby of Texas instruments.

Answer 9

Integrated Circuits

Question 10

This includes AM and FM radio, television, and satellite communication.

Answer 10

Communication Electronics

Question 11

Electronics play an important role in the control and monitoring of electrical systems as in power plants, refineries, etc.

Answer 11

Electric Power

Question 12

The circuits for digital applications operate with pulse of voltage or current.

Answer 12

Digital Electronics

Question 13

Applied to cars for changing battery, measuring gauges and monitoring of engine performances.

Answer 13

Automotive Electronics

Question 14

Includes control of heating and welding processes, the use of elevator’s control, operating of copying machines, automatic door openers and burglar alarms.

Answer 14

Industrial Electronics

Question 15

Combines electronics with biology, medical research, diagnosis and treatment, all use electronic equipment.

Answer 15

Medical Electronics

Question 16

Smallest particle of an element that possesses the unique
characteristics of that element.

Answer 16

Atom

Question 17

All matter is composed of?

Answer 17

Atoms

Question 18

All atoms consist of electrons,
protons, and neutrons except?

Answer 18

Normal hydrogen

Question 19

He proposed that the electrons in an atom circle the nucleus in
different obits, similar to the way planets orbit the sun in our solar
system.

Answer 19

Niels Bohr

Question 20

The Bohr model is often referred to as the?

Answer 20

Planetary model

Question 20

According to this model, atoms have a planetary type of structure that consists of a central
nucleus surrounded by orbiting electrons.

Answer 20

Bohr model

Question 21

The nucleus consists of positively charged particles called

Answer 21

Protons

Question 22

The nucleus consists of uncharged particles called

Answer 22

Neutrons

Question 23

The basic particles of negative charge

Answer 23

Electrons

Question 24

The number of protons in the nucleus, which is the same as the number of electrons in an electrically balanced (neutral) atom.

Answer 24

Atomic number

Question 25

Electrons near the nucleus have ___ energy than those in more distant orbits.

Answer 25

Less

Question 26

In an atom, the orbits are grouped into energy levels known as ___

Answer 26

Shells

Question 27

The maximum number of electrons in each shell

Answer 27

2n^2

Question 28

The outermost shell of the atom is known as

Answer 28

Valence Shell

Question 29

Electrons in the valence shell

Answer 29

Valence electrons

Question 30

They are electrons dislodged from the outer shell of an atom.

Answer 30

Free Electrons

Question 31

Materials capable of having many free electrons and which could carry electric current are called

Answer 31

Conductors

Question 32

Materials capable of having very few free electrons are called

Answer 32

Insulators

Question 33

Materials capable of having not so many free electrons

Answer 33

Semiconductors

Question 34

Based on shared electron pairs of nonmetals.

Answer 34

Atomic bond

Question 35

Electric charges do not flow freely in this material

Answer 35

Insulators

Question 36

Materials that permit electrons to flow freely from particle to particle

Answer 36

Conductors

Question 37

In any metal element, it contains less than __ electrons in its outer shell

Answer 37

4

Question 38

Solids whose conductivity lies between the conductivity of conductors and insulators.

Answer 38

Semiconductor

Question 39

2 classification of semiconductor materials

Answer 39

Single crystal and compound

Question 40

A semiconductor material that has a repetitive crystal structure

Answer 40

Single crystal

Question 41

A semiconductor materials that is constructed of two or more semiconductor materials of different atomic structures

Answer 41

Compound

Question 42

The difference in energy between the valence band and the conduction band is called

Answer 42

Energy gap or band gap

Question 43

The bonding of atoms, strengthened by the sharing of electrons

Answer 43

Covalent bond

Question 44

The atoms align to form a pattern

Answer 44

Crystal

Question 45

The outermost shell contains not more than __ electrons.

Answer 45

8

Question 46

Free electrons are also called

Answer 46

Conduction electrons

Question 47

A semiconductor material that has been carefully refined to reduce the number of impurities to a very low level

Answer 47

Intrinsic semiconductor

Question 48

The free electrons in a material due to external causes are referred to as ___

Answer 48

Intrinsic carriers

Question 49

Ability of the free carriers to move throughout the material

Answer 49

Relative mobility

Question 50

It has positive temperature coefficient.

Answer 50

Conductor

Question 51

A process of adding impurities to pure semiconductor material to provide positive and negative charges.

Answer 51

Doping

Question 52

It is added to increase the number of conduction-band electrons in intrinsic silicon

Answer 52

Pentavalent impurity atoms

Question 53

Diffused impurities with five valence electrons

Answer 53

Donor atoms

Question 54

It is added to increase the number of holes in intrinsic silicon

Answer 54

Trivalent impurity atoms

Question 55

Hole current flows only in ___ semiconductors

Answer 55

P-type

Question 55

The current in n-type semiconductors and all wire conductors.

Answer 55

Electron flow

Question 56

It is a stable charge in the nucleus that is not free to move.

Answer 56

Proton