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(1 exact duplicate found)

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5 Written questions

5 Matching questions

  1. Geocentric
  2. Doppler Effect
  3. radiant energy
  4. main sequence
  5. fusion
  1. a Creation of energy by joining the nuclei of two hydrogen atoms to form helium.
  2. b the apparent change in frequency of electromagnetic or sound waves caused by the relative motions of the source and the observer
  3. c energy that travels in waves (includes solar energy, light energy)
  4. d having the earth as the center
  5. e a diagonal area on an HR diagram that includes more than 90 percent of all stars

5 Multiple choice questions

  1. An increase in the measured frequency of light from an approaching source.
  2. the vertical distance from the crest of a wave to the trough
  3. a lens that is thinner in the middle than at the edges
  4. Proposed a geocentric model
  5. The warmest layer, and the layer before the exosphere

5 True/False questions

  1. mediuma substance through which a wave can travel


  2. gravitymass per unit volume


  3. CopernicusPolish astronomer who produced a workable model of the solar system with the sun in the center (1473-1543)


  4. refractionbending of a ray of light


  5. conductionthe direct transfer of heat from one substance to another substance that it is touching