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5 Written Questions

5 Matching Questions

  1. Kepler's first law states that a planet moves around the Sun in a(n)
  2. According to Newton's laws, a for must be acting whenever
  3. A planet at inferior conjunction is always
  4. The chemical makeup of a star's surface is usually inferred by
  5. What is the half-life of a sample of matter containing radioactive element?
  1. a the direction of an object's motion changes.
  2. b closer to the Earth than the Sun is.
  3. c elliptical orbit, with the Sun at one focus.
  4. d spectroscopy of the light emitted by the star.
  5. e time needed for half the radioactive atoms in the sample to decay.

5 Multiple Choice Questions

  1. visible light, UV radiation, X rays, gamma rays
  2. shows absorption features where light has been absorbed by the atoms of the cool gas.
  3. in circular epicycles while the centers of the epicycles move in circular orbits around the Earth.
  4. proved mathematically that light could b described by oscillating electric and magnetic fields.
  5. Solar spectra show absorption in spectral lines that are characteristic of iron and are unique to it.

5 True/False Questions

  1. To a physicist, a blackbody is defined as an object thatpath traced out by the Sun in our sky over one year against the background stars.

          

  2. Why was adaptive optics developed?The air molecules scatter blue light better than red light, so more blue light reaches our eyes.

          

  3. Why is the sky blue?bending of light as it enters a dense but transparent material at an angle to the perpendicular to the surface of the material.

          

  4. The spectrum of a star shows a set of dark absorption lines equivalent to the absorption lines of the Sun but with one exception: Every line appears at a slightly longer wavelength, shifted toward the red end of the spectrum. What conclusion can be drawn from this observation?celestial equator and the star, measured along a great circle passing through both celestial poles.

          

  5. Are the constellations seasonal?Yes, On a summer night many of the constellation you can see are different from the constellations you can see on a winter night. But there are some constellations you can see all year long.

          

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