Chapter 10 Sefinitions

Question 1

Wave

Answer 1

A disturbance that transfers energy from one point to another without transferring matter

Question 2

Crest

Answer 2

The highest point in a wave

Question 3

Trough

Answer 3

The lowest point in a wave

Question 4

Rest position

Answer 4

The level of water when there are no waves

Question 5

Wavelength

Answer 5

Distance from one place in a wave to the next similar place on the wave

Question 6

Amplitude

Answer 6

The wave height from the rest position of the wave to the crest or the depth from rest to the trough

Question 7

Frequency

Answer 7

The rate of repetition of a wave

Question 8

Electromagnetic radiation

Answer 8

A wave pattern made of electric and magnetic fields that can travel through empty space

Question 9

Electromagnetic spectrum

Answer 9

The entire range of electromagnetic radiation

Question 10

Model

Answer 10

A representation of an object event or process based on our observation of its characteristics and properties

Question 11

Property

Answer 11

An common attribute to all substances or objects of the same group

Question 12

Wave model of light

Answer 12

The similarities between the lift and movement of waves in the surface of water to explain several properties of light

Question 13

Prism

Answer 13

A transparent glass or plastic object with flat polished sides

Question 14

Visible spectrum

Answer 14

The range of different colours of light

Question 15

Additive colour theory

Answer 15

White lift is composed of different colours of light

Question 16

Reflect

Answer 16

Bounce off the object

Question 17

Subtractive colour theory

Answer 17

Coloured matter selectively absorbs different colours of wavelengths of light

Question 18

Bioluminescence

Answer 18

The ability of a plant or animal to produce light

Question 19

Incandescent light

Answer 19

Light that is produced by an object such as metal that is at a very high temperature

Question 20

Fluorescent light

Answer 20

Light emitted by some substances when they are exposed to electromagnetic radiation

Question 21

Phosphor

Answer 21

A substance that glows after being exposed to energized particles

Question 22

Phosphorescence

Answer 22

The ability to store the energy from a source of light and then emit it slowly over a long period

Question 23

Chemiluminescence

Answer 23

Light produced from a chemical reaction without a rise in temperature

Question 24

Tribiluminescence

Answer 24

Producing light from friction

Question 25

Electric discharge

Answer 25

A method for producing light in which an electric current passes through air or another gas such as neon

Question 26

Electroluminescent

Answer 26

The process of transforming electrical energy directly into lift energy

Question 27

Light emitting diode

Answer 27

An electeicluminescnet light source made it of a martial called a semiconductor

Question 28

Semiconductor

Answer 28

A material that can be made to change how well it conducts electricity

Question 29

OLED

Answer 29

Organic light emitting display | A light source made of several extremely thin layers of organic molecules that use an electric current to produce light

Question 30

Plasma display

Answer 30

Each colour is a tiny fluorescent light in which an electrical signal causes a bad such as neon to release uv

Question 31

LCD

Answer 31

Liquid crystal display | A white light such as a fluorescent light or light emitting diode shines behind a liquid crystal

Question 32

Liquid crystal

Answer 32

A solid that can change the orientation of its molecules like a liquid

Question 33

Ray model of light

Answer 33

Light is represented as straight lines called rays which show the direction that light travels

Question 34

Transparent

Answer 34

Transmit light freely absorb and reflect very little light

Question 35

Translucent

Answer 35

Transmit some light but not enough to see through the material clearly p

Question 36

Opaque

Answer 36

Absorb and reflect light do not transmit any light

Question 37

Umbra

Answer 37

The part of the shadow in which all light rays from the light source are blocked

Question 38

Penumbra

Answer 38

The area of partial shadow from a non point light source is called the penumbra

Question 39

Regular reflection

Answer 39

Light rays strike a smooth surface and reflect in the same direction staying parallel to each other

Question 40

Diffuse reflection

Answer 40

Light rays reflect off a rough or uneven surface they do not remain parallel but are scattered in different directions