Physical Science 1120 Self Test

device that converts AC to DC

rectifier

process in which a beam is moved back and forth across a screen

scanning

moderator

slows neutrons

layer of n-type semiconductor

epitaxial layer

layer of insulating material

passivating layer

control grid

regulates intensity of flow of electrons

FM

frequency modulation

control rod

regulates rate of fission reaction

The problem of transmitting a human voice on a radio wave was solved by using ____________ radio waves

modulated

emit amber or green light

monochromatic CRTs

types of nuclear reactions

radioactive decay, fission, fusion

Nuclear ____________ is the emission of high-speed particles and electromagnetic radiation caused by the breakdown of unstable nuclei of certain elements

radioactivity

Name two radioactive elements

radium and polonium

cathode

receives video signal and emits electrons

________________ is the science that deals with the emission, behavior, and control of electrons

electronics

Integrated circuits are less _____________ and ___________ in size than other solid-states components

expensive and smaller

deflection yoke

performs scanning

Joseph John Thomson discovered that electrons had a negative change because they were _____________ by positive electrostatic fields and _____________ by negative ones

attracted, repelled

emit white light

black-and-white CRTs

CRT

cathode ray tube

components of an electron gun

control grid, 2 anodes, cathode

A television viewer may lose some of his imagination and ____________

creativity

electronic device containing two electrodes

diode

emit red, green and blue light

color CRTs

The major disadvantage of _____________ radio is that other electromagnetic waves in the vicinity destructively interfere and produce static interference

AM

Voltage applied to the gate of a _____________ transistor controls current

field-effect

FET

field-effect transistor

components of a triode

filament, grid, plate

________________ substances emit energy in the form of visible light as electrons gradually fall to lower energy levels after they have jumped to a higher energy level because of absorbing ultraviolet light

fluorescent

focusing anode

focuses electrons into a narrow beam

Y

gamma ray

IC

integrated circuit

A np semiconductor, joined at a _____________, functions as a diode to control the flows of electricity

junction

Input current controls output current in a ______________ transistor

junction

single plate on which drawings are duplicated

mask

A ____________ radio wave is produced by impressing audio-frequency waves on a carrier wave

modulated

Input current controls output current in a _____ transistor

Junction

Transistor

Transfer resistor

(2)He(4)

alpha particle

Nuclear radiation includes _____________ particles, __________ particles, and _________ rays

alpha, beta, gamma

A triode act both as a rectifier and as an ______________

amplifier

More scientific discoveries have been made during the last 140 years because modern scientists have a better understanding of the __________ and its _________

atom, structure

(-1)B(0)

beta particle

Germanium becomes a ____________, or p-type, semiconductor when it is doped with boron from the IIIA Group

positive

silicon wafer of p-type semiconductor material

substrate

A fusion reaction requires intense ___________ and ___________

temperatures, pressures

___________ emission is the emission of electrons from a hot, glowing object

thermionic

AM

amplitude modulation

The image on a color screen appears to be a solid picture because the dots are very ___________, the scanning process is extremely ____________, each dot tends to glow even after the bean has passed over it, and our eyes continue to see light even after it has disappeared

tiny, fast

primary components of modern electronic devices

transistor, integrated circuit

electronic device containing three electrodes

triode

evacuated glass bulb in which current flows across vacuum

vacuum tube

spot etched off wafer by acid solution

window

Voltage applied to the gate of a ____ transistor controls currents

Field-effect

accelerating anode

speeds up electrons and shoots them toward screen

The inside of a CRT screen is coated with rows of ______________

phosphorescent dots

components of a television screen

photocathode, target, camera tube

core

contains uranium fuel

B

beta particle

Transistors are less ____________, more ____________, and ____________ in size than vacuum tubes

expensive, energy efficient, smaller

An n-type semiconductor contains a _____________ electron; a p-type semiconductor contains a ____________

free, "hole"

_______________ could satisfy the energy needs of the world if it ever becomes possible to produce it efficiently

fusion energy

device in which electric current causes gases to emit light

gas-discharge tube

The semiconductor germanium becomes a negative, or ____________, semiconductor when it is doped with arsenic from VA Group

n-type

The ____________ effect is the glow caused by thermionic emission

Edison