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5 Written questions

5 Matching questions

  1. One light-year is the
  2. What is the half-life of a sample of matter containing radioactive element?
  3. When Saturn is closest to the Earth, it is at
  4. The position of an element in the periodic table is directly related to the
  5. the energy flux, F, from a star is the amount of
  1. a energy emitted by each square meter of the star's surface each second.
  2. b number of protons in the atomic nucleus and hence its positive charge.
  3. c opposition.
  4. d distance that light travels in one year.
  5. e time needed for half the radioactive atoms in the sample to decay.

5 Multiple choice questions

  1. violet light has a shorter wavelength than red light.
  2. The air molecules scatter blue light better than red light, so more blue light reaches our eyes.
  3. closer to the Earth than the Sun is.
  4. temporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.
  5. spectroscopy of the light emitted by the star.

5 True/False questions

  1. A perfect circle is an ellipse with an eccentricity ofzero.

          

  2. Which of the following characteristics of an astronomical telescope is the most important for determining the angular resolution?diameter of the objective lens or mirror.

          

  3. Visible wavelengths of electromagnetic radiation have a range of wavelengths oftemporary reversal of the planet's normal west-to-east motion past the background stars as seen from the Earth.

          

  4. What is the main reason for using several radio telescopes together as an interferometer?to obtain much better angular resolution or sharpness in the images.

          

  5. According to modern atomic theory, light emitted by atoms originates fromtransitions of electrons between electron levels of the same atom.

          

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