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Review for Stars & Galaxies Chapter 28 sections 1-3

Review for Stars & Galaxies Chapter 28 sections 1-3. As wavelength increases, frequency _________________. Decreases. The visible portion of the electromagnetic spectrum can be separated into colors because each color represents a different __________________. wavelength.

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Review for Stars & Galaxies Chapter 28 sections 1-3

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  1. Review forStars & Galaxies Chapter 28sections 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 star’s composition, what else can a star’s 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 sun’s 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. It’s chemical composition (what elements are in the star)

  50. _________ are red giant stars.

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