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Grade 10 Phys > optics unit 1 test > Flashcards

optics unit 1 test Flashcards

1
Q

what is light?

A

visible light is an electromagnetic wave (electromagnetic spectrum, classified by energy)

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2
Q

2 ways to describe light

A

wave and particle

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3
Q

all waves travel at the speed of

A

3.00x10>8 m/s

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4
Q

higher frequency equal

A

higher energy

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5
Q

order of spectrum from slowest to fastest

A

radio waves
microwaves
infrared light
visible light (smallest section)
ultra violet light
x-rays
gamma rays

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6
Q

visible light is apart of the spectrum that can be seen by the human eye (T/F)

A

True

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7
Q

light released by the sun

A

UV (ultraviolet light) causes sunburns and reactions

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8
Q

light needs a medium to travel (T/F)

A

false

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9
Q

examples of radio waves

A

AM/FM radio
TV signals
cellphone communication

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9
Q

examples of radio waves

A

AM/FM radio
TV signals
cellphone communication

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10
Q

what type of light are:
remote controls
laser
physical therapy

A

infrared light

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11
Q

examples of visible light

A

human vision
concert lighting
rainbows

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12
Q

what type of light are:
microwave ovens
telecommunications
astronomy

A

microwaves

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13
Q

what is an example of all types of light except visible light?

A

astronomy

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14
Q

x-rays

A

medical imaging
security equipment
cancer treatment

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15
Q

what type of light are:
cancer treatment
product of some nuclear decay

A

Gamma rays

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16
Q

what region is visible light on the electromagnetic spectrum

A

380nm to about 750nm

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17
Q

relation between colour an speed of light

A

larger the number slower the wave length
lower the number faster the wave length
red = slow
purple = fast

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18
Q

8 ways light is produced
I Eat Pigs For Church Because They Love

A

incandescence
electric discharge
phosphorescence
fluorescence
chemiluminescence
bioluminescence
triboluminescence
LED’s

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19
Q

incandescence

A

light produced by something that has reached a high temp
(lava/fire)
cooler the object the redder it is
eventually
hotter object the bluer it is
glowing

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20
Q

incandescence light bulb

A

tungsten filament heats up with elec current and glows

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21
Q

electric discharge

A

light produced by elec current passing through gas
diff gasses produce different colours of light

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22
Q

elec discharge pattern of colours

A

glowing red
red deep orange
purple
blue
light blue/white

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23
Q

phosphorescence

A

light produced by chem phosphorus
these materials can store and absorb UV light energy
energy absorbed is released as lower energy visible light
diff materials = diff periods of time energy stored

24
Q

fluorescence

A

the immediate admission of visible light as a result of UV light
have mercury atoms that release UV light when light hits fluorescent material visible light is created
(detergents contain fluorescent dyes)

25
Q

chemiluminescence

A

direct production of light as the result of a chem reaction
with little or no heat produced
(glowsticks)

26
Q

bioluminescence (think bio)

A

result of chem reactions within a living organism that releases visible light
(firefly) = produce an enzyme called luciferase that starts the reaction that produces light

27
Q

triboluminescence (cheating person)

A

production of light when crystals are scratched crusted or rubbed
CaF2 and ZnS

28
Q

LED’s
light Emiting diodes

A

produce light as a result of a one way current flowing through semi conductors

29
Q

light travels in

A

straight lines
represented with an arrow on it showing direction of travel

30
Q

what is the use of light rays to determine the path of light when it strikes objects

A

geometric optics

31
Q

transparent

A

light completely passes through

32
Q

translucent

A

some light passes through (absorb/reflects the rest)

33
Q

opaque

A

no light passes through
(absorbs/reflects all light)

34
Q

what is a mirror?

A

polished surface able to create an image

35
Q

what is an image?

A

reproduction of an object using light

36
Q

light hits the _____ and is ______ or ______ back, which allows for the creation of the _______

A

mirror
bounced
reflected
image

37
Q

what are mirrors made out of?

A

clear glass and layer of film (piece of metal as backing)

38
Q

incident ray

A

incoming ray that strikes a surface

39
Q

reflected ray

A

bounces off reflected surface

40
Q

the normal

A

perpendicular to mirror

41
Q

angle of incidence

A

angle between incident ray and normal

42
Q

angle of reflection

A

angle between reflected ray and normal

43
Q

laws of reflection

A
  1. angle of incidence = angle of reflection
  2. incident rays, reflected ray , and the normal all line in the same plane
44
Q

specular reflection

A

reflection of light off a smooth surface

45
Q

diffuse reflection

A

reflection of light off of irregular or dull surface

46
Q

SALT

A

S = size of image
A = attitude of image (upright/ inverted)
L = location of image
T = type of image (real/virtual)

47
Q

shape of mirror results in

A

new type of image

48
Q

concave mirrors

A

convergence: where light rays end up meeting at a specific point called the focus

49
Q

concave mirrors diagram easy

A

1 parallel then through focus
2 center of curvature reflected back onto itself
3 through focus then parallel (opp of 1)
4 ray aimed at vertex following LOR (think normal mirror)

50
Q

light behind C concave
(parallel through focus) (focus through parallel)

A

smaller
inverted
between C and F
real

51
Q

light on C concave

A

same size
inverted
at C
real

52
Q

light between C and F concave

A

larger
inverted
behind C
real

53
Q

light on F concave

A

no image formed reflected rays are parallel
2nd line goes through vertex bc its on F

54
Q

light in front of F concave

A

behind mirror
larger
upright
virtual
line through center of curvature to top of light source continues behind mirror
2nd line through vertex bc in front of F

55
Q

convex mirrors

A

diverging light rays = spread apart on contact with mirror (always virtual and smaller images)

56
Q

convex mirror diagram easy

A

1 parallel diverge off in line with focus
2 in line with C back onto itself
3. in line with focus then parallel (opp of 1)

57
Q

what is C F and line

A

C = center of curvature
F = focus
line = principle axis/ normal

Grade 10 Phys (2 decks)

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