mid term

Question 1

light is

Answer 1

light is a form of energy that travels in waves

Question 2

5 basic properties of light

Answer 2

1. light travels in straight lines
2. light can be reflected
3. light bends travelling in different mediums
4. light can be absorbed
5. light is a form of energy

Question 3

luminous vs non- luminous

Answer 3

lum. objects that emit light
non-lum. objects that do not emit light

Question 4

natural light sources

Answer 4

light that naturally occurs
- bioluminescent
- sunlight
- lighting
- anything hot ( fire, lava, heated metal)

Question 4

artificial light source

Answer 4

Man-made light
Incandescent - classic light blub, small wire that burns
Fluorescent- glass tube covered in phosphor is filled with mercury gas
Phosphorescent - stores light rays and emits the light after the UV has stopped ( glow in the dark)
LED- a semiconductor that emits light when electricity passes through it

Question 5

light interactions

Answer 5

• absorbed
• reflected
• refracted

Question 6

types of materials

Answer 6

transparent - clear, all light passes through it
translucent - blurry, allows some light to go through it
opaque - solid, allows no light to go through it

Question 7

what is a ray diagram

Answer 7

a diagram that shows light bouncing off an object

Question 8

incident ray

Answer 8

a ray approaching a surface

Question 9

reflected ray

Answer 9

a ray that is reflected off a surface

Question 10

normal

Answer 10

an imaginary line drawn perpendicular to the surface directed outwards from the point of incidence

Question 11

angle of incidence

Answer 11

the angle from the incendent ray to the normal line

Question 12

angle of reflections

Answer 12

the angle from the normal lin to the reflected ray

Question 13

Euclid law

Answer 13

angle of incident = angle of reflection on a smooth surface

Question 14

plane mirror

Answer 14

a flat mirror

Question 15

concave mirror

Answer 15

curves inwards, can generate heat, image will be up side down the further back but right side up closer in, might appear larger

Question 16

Convex mirror

Answer 16

curves outwards, the image will be upright and small

Question 16

What is refraction

Answer 16

when light moves through different mediums it moves at different speeds
more dense = moves slower
less dense = moves faster

Question 17

cell membrane?

Answer 17

holds the parts of a cell together

Question 18

cell wall

Answer 18

the outer part of a plant cell
harder then membrane

Question 19

Mitochondria

Answer 19

the powerhouse of cell
nutrients is digested and energy is made

Question 20

Cytoplasm

Answer 20

fills the cell and keeps everything in place

Question 21

vacuole

Answer 21

storage bin

Question 22

nucleus

Answer 22

controls everything in the cell, like the brain

Question 23

chloroplast

Answer 23

converts light into sugar

Question 24

6 things that all living things must have

Answer 24

- produce waste - grow/ develop - reproduce - need energy - adaptations - made of cells

Question 25

Cell theory

Answer 25

cells are the basic unit of life; all cells come from existing cells

Question 26

how to calculate the field of view on a microscope

Answer 26

eyepiece x objective lense

Question 27

animal cells

Answer 27

more rounded multiple vacuoles

Question 28

plant cells

Answer 28

more spiky and less round has cloroplast has cell wall one big vacuoles

Question 29

what is a cell

Answer 29

the basic unit of life

Question 30

osmosis

Answer 30

the process of water going in or out of a cell membrane

Question 31

diffusion

Answer 31

solutions going from high considerate place to low considerate place solutions going through a cell membrane

Question 32

what are each membrane

Answer 32

permeable - lets everything through semi-permeable - let some things through impermeable - lets nothing through

Question 33

how does light travel from the mirror to the eyepiece?

Answer 33

light -> diaphram -> objective lense -> eyepiece

Question 34

main organs of the circulatory system

Answer 34

heart, veins, Arteries and capillaries

Question 35

main organs of the respiratory system

Answer 35

lungs

Question 36

main organs of the digestive system

Answer 36

mouth, esophagus, stomach,small entestain

Question 37

main organs of the nervous system

Answer 37

brain, spinal cord, and nerves.

Question 38

main organs of the excretory system

Answer 38

kidney, ureter, urinary bladder, urethra and pee

Question 39

main organs of the endocrine system

Answer 39

glands, sweat