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Science 8th grade > Chapter 9 Test > Flashcards

Chapter 9 Test Flashcards

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0
Q

Define electromagnetic radiation

A

The energy that the wave transfers through matter and space

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1
Q

Define electromagnetic wave

A

A disturbance that involves the transfer of electric and magnetic energy

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2
Q

Electromagnetic energy can travel through..

A

Empty space because it doesn’t require A median to travel through

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3
Q

What is a electromagnetic wave made up of

A

Vibrating electric and magnetic fields that move through space or some medium at the speed of light

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4
Q

The suns energy arrives on earth as what

A

Electromagnetic radiation

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5
Q

Define crest

A

Top of a wave

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6
Q

Define wavelength

A

The distance between the crest of one wave in the crest of the next

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7
Q

Define frequency

A

The number of ways that pass a given point in a certain amount of time

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8
Q

What happens to electromagnetic waves and they travel through a vacuum

A

All electromagnetic waves travel at the same speed in a vacuum but they have different wavelengths and different frequencies

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9
Q

Define vacuum

A

A space that contains no air other gases

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10
Q

the relationship between frequency of a wave in its energy

A

The higher the frequency of a wave to higher its energy

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11
Q

What does a spectrograph show

A

That the suns radiation includes all these different types of waves

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12
Q

Define electromagnetic spectrum

A

The complete range of electromagnetic waves placed an order of increasing frequency

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13
Q

Order of the electromagnetic spectrum

A

Radio waves microwavea infrared rays visible light ultraviolet radiation from x-rays and gamma rays

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14
Q

Infrared rays

A

Invisible heat from something given off, heat Rays

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15
Q

Law of reflection

A

The angle of reflection equals the angle of incidence

16
Q

Define image

A

A copy of the object form by reflected or refracted rays of light

17
Q

Two different types of reflection

A

Regular reflection and diffuse reflection

18
Q

When does diffuse reflection occur

A

When parallel rays of light hit an uneven surface

19
Q

Plane mirror

A 
A flat sheet of glass that has a smooth, silver covered coating surface on one side. 
The image is 
Virtual 
Upright 
Same size as the object
20
Q

Virtual image

A

An image that forms where light seems to come from

21
Q

Real image

A

Forms when light rays actually meet

22
Q

Concave mirrors

A

A mirror with a surface that curves inward like a bowl

23
Q

Optical axis

A

An imaginary line that divides the mirror in half

24
Q

Define focal point

A

The point at which rays parallel to the optical axis reflect and meet

25
Q

Object is farthest away from a concave mirror

A

Upside down image
Image is smaller
Real image

26
Q

Image is a medium distance from a concave mirror

A

Image is larger
Upside down
Real

27
Q

Object is close to a concave mirror

A

Image is bigger
Right side up
Virtual

28
Q

Object in a convex mirror

A

Virtual
Upright
Smaller

29
Q

When light hits an object it can be

A

reflected refracted or absorbed

30
Q

The more transparent an object is…

Tell the relation ship between light and clear glass

A

The less light it will absorb

All light passes through clear glass

31
Q

Define and opaque object

Relationship between light and solids

A

An opaque object will both reflect and absorb light

No light passes through a solid

32
Q

Define translucent

A

Translucent allows some light to pass through but not all

33
Q

Refraction can cause you to see

A

Something that may not actually be there

34
Q

What happens when light is passed from one medium to the next

A

It is refracted

35
Q

Define index of refraction

A

A measure of how much a light ray bends when it enters that medium

Science 8th grade (3 decks)

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