Answers to Physics Module Questions - Module #33
  1. Your hand and your table are both mostly empty space. Despite this, your hand does not pass through the table because
    1. Your hand does not realize that it is mostly empty space
    2. Your table does not realize that it is mostly empty space
    3. Your table is not mostly empty space
    4. Your hand is not mostly empty space
    5. magnetic fields keep your hand from passing through the table
    6. electric fields keep your hand from passing through the table
    7. gravitational fields keep your hand from passing through the table
  2. We encounter radioactivity during the course of our lives. Most of this exposure comes from
    1. radios
    2. TV
    3. nuclear power plants
    4. nuclear weapons testing
    5. space ships
    6. aliens
    7. the natural environment
    8. medical and dental X-rays
  3. An alpha particle is absorbed by an atomic nucleus. If nothing else happens what changes in the nucleus.
    1. the number of protons is reduced
    2. the number of electrons is reduced
    3. the number of neutrons is reduced
    4. the number of protons is increased
    5. the number of electrons is increased
    6. the number of neutrons is increased
  4. What happens if a Lithium atom emits an alpha particle? It becomes
    1. a lithium isotope
    2. a lithium ion
    3. helium
    4. hydrogen
    5. beryllium
    6. boron
    7. oxygen
  5. A 12,000 year-old sample of old carbon is 1/4 as radioactive as a current sample of carbon. Based on this value, what is the approximate half-life of Carbon 14.
    1. 12,000 years
    2. 12,000 days
    3. 6,000 years
    4. 6,000 days
    5. 3,000 years
    6. 3,000 days
    7. 24,000 years
    8. 48,000 years

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