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7th grade science > chapter 2 study guide science > Flashcards

chapter 2 study guide science Flashcards

0
Q

The ability to do work

A

Energy

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1
Q

A disturbance that transfers energy from place to place

A

Wave

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2
Q

The material through which a wave travels through

A

Medium

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3
Q

The lowest point of a wave

A

Trough

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4
Q

The highest point of a wave

A

Crest

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5
Q

The repeated back-and-forth or up-and-down motion

A

Vibration

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6
Q

What are the properties of waves

A

Frequency, speed, wavelength, amplitude

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7
Q

The maximum distance the particles of a medium can move from their rest positions

A

Amplitude

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8
Q

The distance between two corresponding parts of a wave

A

Wavelength

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9
Q

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

A

Frequency

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10
Q

Frequency is measured in units called _______

A

Hertz

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11
Q

A wave that transfers electric and magnetic energy

A

EM wave

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12
Q

The energy that is transferee through space by EM waves

A

EM radiation

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13
Q

The complete range of EM waves placed in order of increasing frequency

A

EM spectrum

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14
Q

EM waves that you can see

A

Visible light

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15
Q

A material that transmits most of the light that strikes it

A

Transparent

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16
Q

A material that scatters light as it passes through it

A

Translucent

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17
Q

A material that reflects or absorbs all of the light that strikes it

A

Opaque

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18
Q

Colored substances ythat are used to color other materials

A

Pigment

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19
Q

Two primary colors combined in equal amounts

A

Secondary colors

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20
Q

Any two colors that combine to form white light

A

Complementary colors

21
Q

Three colors that combine to make any other color

A

Primary colors

22
Q

Occurs when an object or wave bounces back off a surface throught which it cannot pass

A

Reflection

23
Q

All waves obey the…. Which states they the angle of incidence is equal to the angle of reflection

A

Law of reflection

24
Q

A flat sheet of glass that has a smooth, silver-colored coating on one side

A

Plane mirror

25
Q

A copy of an object formed by reflected or refracted rays of light

A

Image

26
Q

An upright Image that forms where the light seems to come from

A

Virtual image

27
Q

A mirror wit ha surface that curves inward

A

Concave mirror

28
Q

An imaginary line that divides a mirror in half

A

Optical axis

29
Q

The point at which rays parallel to the optical axis meet or converge

A

Focal point

30
Q

Forms when Rays a ctuslly meet

A

Real image

31
Q

A mirror with a surface that curves outward

A

Convex mirror

32
Q

Bending in light waves due to a change in speed

A

Refraction

33
Q

A curved peice of glass or other transparent material that’s reflects light Rays that pass through it

A

Lens

34
Q

A lens that is thicker in the center and thinner at the edge

A

Convex lens

35
Q

Thinner at the center than at the edges

A

Concave lens

36
Q

A transparent surface where light enters the eye

A

Cornea

37
Q

an opening through which light enters the inside of the eye

A

Pupils

38
Q

A ring of muscles that contracts and expands to change the size of the pupil

A

Iris

39
Q

A layer of cells that lines the inside of the eye

A

Retina

40
Q

Contain pigment that responds to small anounts of light

A

Rods

41
Q

Respond to color

A

Cones

42
Q

Can see nearby things clearly but distant objects are blurry

A

Nearsighted

43
Q

Can see far away things clearly but nearby objects are blurry

A

Farsighted

44
Q

Uses one or more lenses to focus light and film to record an image

A

Camera

45
Q

Forms enlarged images of distant objects

A

Telescope

46
Q

A telescope that consists of two conves lenses

A

Refracting telescope

47
Q

Gathers the light coming from an objects and focused the Rays to form a real image

A

Objective

48
Q

Magnifies the image so you can see it clearly

A

Eyepiece

49
Q

Used a large concave mirror to gather light

A

Reflecting telescope

50
Q

An optical tool that makes small objects looks larger

A

Microscope

51
Q

Uses a tiny beam of electrons instead of light to produce a magnified image

A

Electron microscope

7th grade science (15 decks)

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