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Science 8 > Unit 3 > Flashcards

Unit 3 Flashcards

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Biology 101 flashcards
1
Q

*Define Light

A

Light is a form of energy that you can see

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2
Q

Define Radiate

A

Spreads out

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3
Q

Define Radiation

A

The transfer of radiant energy (light) that does not require matter (travels in waves)

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4
Q

Define Radiant Energy

A

Energy such as light that travels in waves

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5
Q

Define Luminous

A

Objects that emit light

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6
Q

Define Non-Luminous

A

Objects that do not emit light

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7
Q

*How do incandescent sources produce light?

A

Objects are heated to such high temperatures that they emit light

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8
Q

What is the energy pathway of incandescent sources?

A

Electrical Energy -> Thermal Energy -> Visible Light

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9
Q

How do florescent sources produce light?

A

Objects that absorb high energy UV light to glow and emit visible light

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10
Q

What is the energy pathway of florescent sources?

A

Electrical Energy -> Energy absorbed by Hg -> UV light energy -> Energy absorbed by phosphor coating -> Visible Light

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11
Q

How do phosphorescent sources produce light?

A

An object that absorbs, stores, ad emits light energy.

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12
Q

What is the energy pathway of phosphorescent sources?

A

Electrical Energy -> Absorbed and Stored -> Visible Light

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13
Q

How do Chemiluminescent sources produce light?

A

An object that emits light from a chemical reaction

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14
Q

What is the energy pathway of chemiluminescent sources?

A

Chemical Energy -> Visible Light

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15
Q

*How do Bioluminescent sources produce light?

A

A living organism that emits light

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16
Q

*What is the energy pathway of bioluminescent sources?

A

Living Organism -> Visible Light

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17
Q

How do you determine the cost of energy?

A
  1. Convert W to KW (divide by 1000)
  2. Calculate KW hours by multiplying KW x hours
  3. Calculate cost by multiply KW h x cost in cents
    =___cents/KW h
18
Q

What are the observations the ray model of light is based on?

A
  • explains shadows

- light rays travel in straight lines from its source

19
Q

Define Ray

A

A straight line that represents the path of a beam of light

20
Q

What is included in a ray diagram?

A

incident ray, reflected ray, normal, reflecting surface, angle of incident, angle of reflection

21
Q

*What happens when light hits transparent material?

A

All light goes through

22
Q

*What happens when light hits translucent material?

A

Some light goes through and some light bounces off

23
Q

*What happens when light hits opaque materials?

A

Light bounce off

24
Q

*Define Reflection

A

Light strikes a surface then bounce off it

25
Q

Define Incident Ray

A

A ray of light from a light source that reflects off a surface

26
Q

Define Reflected Ray

A

A ray of light that bounce off a surface

27
Q

Define Normal

A

The line that is 90 degrees the reflecting surface

28
Q

Define Angle of Incidence

A

The angle between the Normal and the incident ray

29
Q

Define Angle of Reflection

A

The angle between the normal and the reflected ray

30
Q

*Define Plane Mirror

A

A mirror with a flat surface

31
Q

*Define the Law of reflection (2 point)

A
  1. Angle i = Angle r

2. i, normal, and r are all in the same plane

32
Q

**Label a diagram of a reflecting surface

A

____

33
Q

*Define Refraction

A

The bending of light as it moves through different mediums of different densities

34
Q

Define Angle of Refraction

A

The new direction of light; angle between the normal line and refracted ray

35
Q

*Define Absorbtion

A

occurs mostly on rough, dark, opaque surfaces

36
Q

Define Reflection

A

Light bounce off a surface; occurs when light hits a shiny, smooth surface

37
Q

Define Refraction

A

Travels through a surface in a different direction; occurs when light hits a different, transparent medium

38
Q

*Define Mirage

A

Occurs when light refracts through different densities of air

39
Q

*What does a concave lens do to light

A

Diverges light

40
Q

*What does a convex lens do to light

A

Converges light to a focal point

41
Q

*What does a convex lens with a smaller curve do to light

A

Focal point forms closer to lens

42
Q

*What does a convex lens with a larger curve do to light

A

Focal point forms farther away from lens

Science 8 (5 decks)

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