Cosmology and Light Crossword

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Across
  1. 6. This form of light has "invisible energy" beyond the red end of the visible spectrum.
  2. 7. Because light is a mix of electric and magnetic energy, it is often called an _____________ ________.
  3. 8. On page 89, it mentions that red colors refer to ___________ wavelengths.
  4. 11. Scientists often speak of light and subatomic particles as having a ____-________ _________, and they use whichever model, wave or particle, that best describes a particular phenomenon.
  5. 13. A ___________ is an object that absorbs all the radiation falling upon it.
  6. 14. This shift is known for its change in wavelength caused by motion, and is a powerful tool for measuring the speed and direction of motion of astronomical objects.
  7. 17. In this principle, we are not at the center of the universe, nor is anyone else.
  8. 18. This form of radiation, known as CMB, is the background noise Penzias and Wilson discovered as leftover heat from the Big Bang.
  9. 20. This is an individual packet of energy moving through space in a straight line at the speed of light.
Down
  1. 1. The wavelengths of visible light are very very small. They are therefore not measured in meters but in billionths of a meter, known as a ____________.
  2. 2. This law states that the wavelength at which an object radiates most strongly is inversely proportional to the object's temperature.
  3. 3. The color of light is determined by the light's ____________.
  4. 4. This property of a wave describes the number of wave crests that pass a given point in 1 second.
  5. 5. Scientists refer to all light waves, including visible light, radio waves, x rays, and more, as the ______________ __________.
  6. 9. J. Ritter discovered this kind of light, which lies just beyond the violet end of the visible spectrum and emits invisible radiation to us.
  7. 10. Some light seems to have no color. Light from such sources is called ______ light.
  8. 12. Human beings can see colors ranging from deep red through orange and yellow into green, blue and violet. We call these colors the ________ ________.
  9. 15. The _______ ___ ________ is a constant value denoted by the letter c. It is equal to 300,000 km per second. (page 87)
  10. 16. This theory is the main theory that states that the Universe was born in a hot, dense state and expanded rapidly.
  11. 19. On page 89, it mentions that blue colors refer to __________ wavelengths.