Science Unit 3 Topics #1-5

Front 1

Define light

Back 1

Is the form of energy you can see

Front 2

List natural light sources

Back 2

-Sun

-Stars

-Flames & sparks

Front 3

List Artificial light sources

Back 3

-Matches

-Flashlight

-Lightbulbs

Front 4

Define radiates

Back 4

Light spreads out

Front 5

Define radiation

Back 5

Energy transfer does not require matter

Front 6

Define radiant energy

Back 6

a light that travels by radiation

Front 7

light can be transformed into ____ and list examples

Back 7

-thermal energy ex. Absorbation by a sweater in sunlight

-electrical energy ex. Solar cells change light into electricity

-chemical energy ex.trees absorb sunlight to make chemical energy

Front 8

Define Incandescence

Back 8

Emisson of visble light from heated object

Front 9

Energy tranformation of incandescent light source

Back 9

Electrical energy ---> Thermal energy -----> Visible light energy

Front 10

Define fluorescence

Back 10

Absorbs ultraviolet light and emits some of the energy

Front 11

Energy transformation of fluorescence

Back 11

Ultraviolet light energy ----->Energy aborbed by particles ---> Visible light energy

Front 12

Energy Pathway for a fluorescent source

Back 12

Electrical energy ---> Energy absorbed by mercury particles ----> ultraviolet light energy -----> energy absorbed by phosphor particles ---> Visible light energy

Front 13

Fluorescent tubes & incandescent light blubs disadvantages & advantages

Back 13

Disadvantages

-more expensive to make

-more diffult than Incan to dispose

-phosphor & mercury vapour is toxic

Advantages

-wastes less energy

-more energy efficent

Front 14

Define Phosphorescence

Back 14

Absorbs light & then slowly realises light over time

Front 15

Define Chemiluminescence

Back 15

Chemical reaction produces energetic particles that give off visible light energy

Front 16

Define Bioluminescence

Back 16

Chemical reaction in the body of a living creature

Front 17

Define luminous

Back 17

All objects that emit light

Front 18

Define non-luminous

Back 18

All objects that do not emit light

Front 19

How to find out cost of lighting

Back 19

Front 20

What is the ray model of light?

Back 20

Based on light that travels in straight lines in all directions when a light strikes a surface its path can be determined.

Front 21

List the following surfaces that light light strikes

Back 21

-transparent lets all light through

-translucent lets some

-opaque lets none

Front 22

Define Reflection

Back 22

Is the process in which light strikes a surface and bounces back off that surface

Front 23

Label

Back 23

Front 24

Define a plane mirror

Back 24

A reflective surface that gives uniform results

Front 25

Law of reflection

Back 25

The angle of relection equals the angle of incidence

Front 26

Define convex mirrors & examples

Back 26

Bludges out , image appears farther & smaller away. Ex. Security mirrors , passenger side of cars

Front 27

Define concave mirrors & examples

Back 27

Curved inside, makes image appear much closer & larger. Ex. Makeup mirrors

Front 28

Define virtual image

Back 28

When you see the image when you look into a mirror.

Front 29

Define refraction

Back 29

Bending of light when it travels from one mediuim to another

Front 30

Define double concave lenses

Back 30

Is thinner & flatter in the middle that around the edges

Front 31

Define double convex lens

Back 31

Thicker in the middle than around the edges

Front 32

Define near-sightness

Back 32

When image falls short of the retina (eye has a longer shape than a regular eye) trouble seeing images far away

Front 33

Define far-sightness

Back 33

When image falls behind retina (eye shorter than normal eye) trouble seeing images close up

Front 34

How to fix near-sightness?

Back 34

With concave lense allows image to fall on retina

Front 35

How to fix far-sightness?

Back 35

With convex lenses allows image to fall on retina

Front 36

Define Retina

Back 36

Light-sensitive area where the image is formed

Front 37

Label each part of the camera

Back 37

Front 38

List the corresponding parts of the camera & eye & definitions

Back 38

Film=retina

Define: created visual image signals

Diaphragm=iris

Define:controls diameter & size , of pupil, controls amount of light

Lens=Lens

Define:changes focal distance

Foccusing ring=cilliary muscle

Define:changes lens shape for foccusing

Optic nerve

Define: transfers visual information

Shutter

Define: Allows light to pass for a certain period of time

Front 39

Label

Back 39

Front 40

Define accomadation

Back 40

The process of changing the shape of the lens to adjust for different object distances

Front 41

Define near point

Back 41

The shortest distance at which an object is in focus

Front 42

Define far point

Back 42

The longest distance in focus

Front 43

Define diaphragm

Back 43

Is a device that controls the aperture

Front 44

Define aperture

Back 44

The opening of a lens or optical system

Front 45

Define shutter

Back 45

Device that limits the passage of light

Front 46

Define iris reflex

Back 46

The natural adjustment in the size of the pupils

Front 47

Define optic nerve

Back 47

When the cells in the retina detect light, they produce small electrical impulses that travel from the retina to the brain

Front 48

Define blind spot

Back 48

The point where the optic nerve enters the retina does not have any light-sensing cells.

Front 49

Define a refracting telescope

Back 49

light from a distant object is collected and focussed by a convex lens called the objective lens. A second lens, called the eyepiece lens, works as a magnifying glass to enlarge the image

Front 50

Define objective lens

Back 50

Focused by convex lens

Front 51

Define eyepiece lens

Back 51

Works as a magnifying glass

Front 52

Define a reflecting telescope

Back 52

uses a concave mirror to collect rays of light from a distant object. The mirror is called the primary or objective mirror. It forms a real image, which is then magnified by the eyepiece lens

Front 53

Define objective mirror

Back 53

Concave mirror to collect rays from distant object

Front 54

Label the refracting telescope

Back 54

Front 55

Label the reflecting microscope

Back 55

Front 56

Define binoculars

Back 56

two reflecting telescopes mounted side by side.

Front 57

Define prisms

Back 57

In binoculars, the telescopes are shortened by placing glass blocks inside , glass blocks. Serve as plane mirrors

Front 58

How did Telescopes make an impact

Back 58

an explosion of scientific knowledge about the universe. No longer were plan- ets just wandering points of light in the dark sky. They became worlds of their own. For astronomers, the starry sky became an expanding cosmos of galaxies linked in truly gigantic formations.