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Science Book 8 > Chapter 6 > Flashcards

Chapter 6 Flashcards

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Biology 101 flashcards
1
Q

What is luminous object?

A

Object that produces its own light

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2
Q

What’s an illuminated object?

A

Object that reflects light
##footnote##
illuminated is nonluminous. Nonluminous isn’t always illuminated.

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3
Q

When does reflection occur

A

When a light ray bounces off an object

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4
Q

Diagram ppt

A

Open this please.

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5
Q

What are the 2 angles and rays called? (Reflecting)

A

Angle of incidence, angle of reflection, incident ray and reflected ray.

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6
Q

The dashed line is called?

A

Normal

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7
Q

Meaning of medium?

A

Material

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8
Q

What is refraction?

A

Change in direction of light when passing from one medium to another Due to change of speed.

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9
Q

Air has more/less density than water.

A

Less

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10
Q

Refracted ray is toward/ away from the normal?
a) air to water/glass
b)water/ glass to air
c) water to glass
d) glass to water

A

a) toward the normal
b) away from the normal
c) toward the normal
d) away from the normal

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11
Q

Which medium does light travel fastest through?

A

Air

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12
Q

What is dispersion

A

Process of splitting of white light to seven spectrum colours

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13
Q

What is an example of dispersion happening?

A

White light passing through a trianglar glass prism

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14
Q

What seven colours are they?

A

ROY G BIV. Red Orange Yellow Green Blue Indigo Violet
##footnote## they are merged together

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15
Q

Who discovered the splitting of white light? When?

A

Issac Newton in 1666

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16
Q

How do rainbows from after/during rain?

A
  1. Refraction from sky to water droplets
  2. Internal reflection
  3. Dispersion and refraction
    ##footnote## yiu have to be behind the sun to see the rainbow cuz of reflection of internal reflection in water droplets
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17
Q

-Red is smallest/largest angle of refraction.
-violet is smallest/largest angle of refraction.

A

Red is smallest, violet is largest

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18
Q

Why is red smallest angle?

A

It’s the fastest light

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19
Q

What are the 3 primary colour of light and what colour is created when they’re merged together?

A

Red, blue, green, they form white light

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20
Q

What are the secondary colours?

A

Red+Green= Yellow
Blue+Red=Magenta
Green+Blue=Cyan
RGY, BRM,GBC

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21
Q

What colour appears when the secondary colour are mixed?

A

Black

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22
Q

What happens to white light when you put a magenta filter and a cyan filter after each other?

A

Magenta is transmitted after white light passes through 1st filter. Then magenta(blue+red) passes through cyan(green+blue) filter. Blue is end product.

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23
Q

Can it travel though matter?
(Light and sound)

A

Yes, they both can

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24
Q

Can it travel through a vacuum?
(Light and sound)

A

Light can but sound can’t

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25
Q

How are they detected?
(Sound and light)

A

Sound==> ears and microphones
Light==> eyes and cameras

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26
Q

Can it be reflected?
(Light and sound)

A

Yes (echoes and mirrors)

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27
Q

Can it be refracted?
(Light and sound)

A

Yes

28
Q

Which is faster?
(Sound and light)

A

Light

29
Q

What material is need for regular/irregular reflection to occur?

A

Plane mirror for regular reflection.
Nonplane for irregular reflections

30
Q

What is a spectrum?

A

Range of colours in white light

31
Q

What is the meaning of primary colours of light?

A

Colours that cannot be made by mixing any other colours of light

32
Q

What is the difference between primary colours of light and primary colours?

A

The colours of light mix differently than the colours in paint

33
Q

How many colours maximum can a phone/device show?

A

256

34
Q

Difference between transmitted and reflected?

A

Transmitted is when it’s a filter so light passes through the medium. Reflected is used when an object is shown to have this colour

35
Q

What makes things look differently colour wise

A

According to what they absorb and reflect

36
Q

What happens when an object doesn’t have any colours of light reflected?

A

It appears black

37
Q

What happens when blue and red filters are put after each other

A

No light is transmitted

38
Q

Why does a white t-shirt appear red in red light?

A

White t-shirt reflects red light

39
Q

Why does a red ball appear red in white light?

A

It absorbs all 6 colours and reflects only red, thus appearing as red object

40
Q

What is a rule in reflection? (Diagrams)

A

Angle of incidence= Angle of reflection

41
Q

Which is bigger? (Galaxy or universe)

A

Universe

42
Q

What is the meaning of universe?

A

Space and everything in it

43
Q

What is the meaning of Galaxy?

A

Group of stars bound together by gravity

44
Q

What is one factor that gravity is affected by?

A

Mass increase

45
Q

What is stellar dust?

A

Dust found in space

46
Q

What are the three types of Galaxies?

A

Spiral, elliptical, irregular

47
Q

What is our Galaxy called? What type is it?

A

Milky way. It is spiral.

48
Q

What is the closest Galaxy to us called? What type is it?

A

Canus major dwarf. Elliptical.

49
Q

How many galaxies are there approximately?

A

100-200 million

50
Q

Why are the stars that we see in the milky way?

A

Closest to earth

51
Q

How much of our Galaxy can we see?

A

One arm of the spiral

52
Q

How does our Galaxy look like?

A

A milky band

53
Q

Why can’t we know accurately the number of stars in our Galaxy?

A

We can’t see all of them

54
Q

How much stars are there in our galaxy?

A

250 million stars approximately

55
Q

What is definition of asteroids?

A

Small, rocky, irregularly shaped objects that orbit the sun

56
Q

What are asteroid belts?

A

Place where asteroids orbit

57
Q

Where do asteroids come from?

A

Leftovers from formation of solar system

58
Q

Where’s the asteroid belt?

A

Between Mars and Jupiter

59
Q

What is the largest asteroid discovered yet?

A

Ceres

60
Q

What is the smallest asteroid yet?

A

Itokawa

61
Q

How might some asteroids change shape?

A

Affected by the tidal forces

62
Q

What’s difference between comets and asteroids

A

Comets have ice cores

63
Q

Ceres was considered a planet. Why?

A

It has core, mantle and crust. It has craters. It is a sphere.

64
Q

Why isn’t Ceres a plant?

A

Too small

65
Q

What happens when asteroids hit the earth?

A
  1. Dust and smoke enter the atmosphere
  2. Decreasing temperature because it blocks the sun
66
Q

Why do asteroids hit earth?

A
  1. Earth’s strong gravity
  2. Some asteroids have orbits that are closer to earth

Science Book 8 (4 decks)

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