12.1

Question 1

the branch of the study of electricity that deals with the behavior and motion of electrons in a vacuum or in semiconductors

Answer 1

electronics

Question 2

a glass tube containing electrodes sealed in a vacuum

Answer 2

vacuum tube (aka electron tube)

Question 3

the positive electrode of a vacuum tube

Answer 3

anode

Question 4

electrons enter vacuum tube through ________and leave through the __________

Answer 4

cathode- enter

anode - leave

Question 5

stream of electrons emitted by the cathode of a vacuum tube

Answer 5

cathode rays

Question 6

a vacuum tube designed so that the cathode rays would miss the anode and strike the end of the tube instead

Answer 6

cathode ray tube ( aka Crook’s tube)

Question 7

cathode rays are actually ___________

Answer 7

streams of electrons

Question 8

a cathode-ray tube designed to generate x-rays

Answer 8

X-ray tube

Question 9

the production of an electron current in a vacuum using a heated cathode - originally known as the edison effect

Answer 9

thermionic emission

Question 10

edison’s bulb allowed current to freely flow in one direction but blocked its movement in the other direction

Question 11

a simple vacuum tube consisting of two electrodes

Answer 11

diode

Question 12

a vacuum tube that has three electrodes and acts as an electron switch that can amplify weak signals

Answer 12

triode

Question 13

_______________ allowed the human voice to be transmitted and received by radio over long distances

Answer 13

triodes

Question 14

_____________ invention if the triode made modern electronic devices possible

Answer 14

De Forest’s

Question 15

the process that is used to increase the number of free electrons and the holes in a semiconductor crystal by replacing

Answer 15

doping

Question 16

a type of material formed by doping silicon with a substance that gives it additional free electrons

Answer 16

n type