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Review for Stars & Galaxies Chapter 28 sections 1-3

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Review for Stars & Galaxies Chapter 28 sections 1-3 Earth-sized stars that are made of only a carbon-oxygen core (left behind from red giants that lose their gases ... – PowerPoint PPT presentation

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Title: Review for Stars & Galaxies Chapter 28 sections 1-3


1
Review for Stars Galaxies Chapter 28 sections
1-3
2
  • As wavelength increases, frequency
    _________________.

3
  • Decreases

4
  • The visible portion of the electromagnetic
    spectrum can be separated into colors because
    each color represents a different
    __________________.

5
  • wavelength

6
  • Two stars are the same size, but different
    temperatures. The (cooler/hotter)
    star will be dimmer.

7
  • cooler

8
  • A shift toward the red end of the spectrum tells
    us that a star is moving __________________ us.

9
  • Away from

10
  • Ultraviolet rays have a _________ wavelength than
    visible rays.

11
  • shorter

12
  • What tool is used to observe the spectrum of an
    element or star?

13
  • spectroscope

14
  • As frequency increases, energy _______________.

15
  • increases

16
  • A _______________ is the distance from one wave
    crest (or trough) to the next wave crest (or
    trough).

17
  • wavelength

18
  • ___________ is a form of electromagnetic (EM)
    radiation that travels in waves, can travel
    through empty space, and moves at 300,000
    km/second.

19
  • light

20
  • Heat is also known as ________________ radiation.

21
  • infrared

22
  • Besides a stars composition, what else can a
    stars spectrum tell us?

23
  • If the star is moving (getting closer or farther)

24
  • A ______________ spectrum is given off by glowing
    solids (ex. filament), glowing liquids (ex.
    molten iron), and hot, compressed gases inside
    stars and emits all visible wavelengths in a
    unbroken band of colors.

25
  • continuous

26
  • How can we identify an element by its spectrum?

27
  • Each element has its own unique spectrum, like a
    fingerprint.

28
  • _______________________ spectra are seen as
    continuous spectra crossed by dark lines formed
    when light from a glowing object passes through a
    cooler gas.

29
  • Absorption

30
  • A shift toward the blue end of the spectrum tells
    us that a star is movin________________ us.

31
  • towards

32
  • What color stars are hottest?

33
  • blue

34
  • ______________ magnitude is how bright a star
    appears to be for an observer on Earth.

35
  • Apparent

36
  • The pointer stars are found in which
    constellation?

37
  • Ursa major (the big bear)

38
  • The sun is what color star?

39
  • yellow

40
  • Why can we see some constellations only in
    certain seasons?

41
  • Earth revolves (orbits) around the sun the
    suns light blocks out the light from the
    constellation

42
  • A light-year is a unit that measures ___________.

43
  • distance

44
  • ____________________ spectra show unevenly spaced
    lines of different colors brightneses, are
    given off by a source that is emitting light of
    only certain wavelengths (such as glowing thin
    gases).

45
  • Emission

46
  • Infrared rays have a __________ wavelength than
    visible rays.

47
  • longer

48
  • The spectrum of a star can tell us
    _________________.

49
  • Its chemical composition (what elements are in
    the star)

50
  • _________ are red giant stars.

51
  • Polaris, Aldeberan

52
  • Alpha Centauri is about ____ ?C has a
    luminosity of about ______.

53
  • 5000 ?C, luminosity of about 1

54
  • True or false the mass of a star can be measured
    directly?

55
  • false

56
  • _________________ is how many times a wave passes
    a given point during a certain time period.

57
  • frequency

58
  • If two stars are the same temperature, but
    different sizes the (larger/smaller) star will be
    brighter.

59
  • larger

60
  • A stars absorption spectrum tells us the
    composition of its __________________ layer.

61
  • outer

62
  • What are the two main elements in stars?

63
  • Hydrogen helium

64
  • Which property determines characteristics of each
    form of electromagnetic radiation?

65
  • wavelength

66
  • Earth-sized stars that are made of only a
    carbon-oxygen core (left behind from red giants
    that lose their gases) are called _______________.

67
  • White dwarfs

68
  • ________________________ radiation can cause
    sunburns, skin cancer, and cataracts.

69
  • Ultraviolet

70
  • During the suns next stage in its life cycle it
    is going to become a _______________.

71
  • Red giant

72
  • Are the following in order from smallest to
    largest or largest to smallest?
  • Planet, main sequence star, giant star, galaxy

73
  • smallest to largest

74
  • What star is about 9000?C and has a luminosity of
    about 0.01?

75
  • Procyon B

76
  • Giant stars are (showing signs of age/young).

77
  • Showing signs of age

78
  • When an object is moving away from us, the wave
    length gets (stretched/compressed)?

79
  • stretched

80
  • What color stars are coolest?

81
  • red

82
  • What type of star is the sun?

83
  • Main sequence

84
  • ___________ is a red dwarf star.

85
  • Barnards star

86
  • Blue super giants have a luminosity of about
    ____________ times that of the suns luminosity.

87
  • 1,000,000

88
  • Black holes from when stars that are (about the
    same size as the sun/much more massive than the
    sun) die.

89
  • much more massive than the sun

90
  • When an object is moving towards us, the
    wavelength gets (stretched/compressed)?

91
  • compressed

92
  • ______________ magnitude is a measure of how
    bright a star really is (if observed from the
    same distance).

93
  • Absolute
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