Physics test 4.2

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Author:
catnthuhat
ID:
52026
Filename:
Physics test 4.2
Updated:
2010-11-28 15:54:24
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physics
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Description:
Atomic nucleus and radioactivity
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  1. The half life of carbon 14 is 5730 years. If a 1 gram sample of old carbon is 1/8 as radioactive as 1 gram of a current sample, then the age of the old sample is about...
    17,200 years.
  2. In order for an atom to decay to an element which is one greater in atomic number, it can emit...
    one alpha particle and 3 beta particles; on positron and 2 beta particles; one beta particle.
  3. It's impossible for a hydrogen atom to emit an alpha particle. (true/false)
    true
  4. Which experiences the greatest electrical force in an electric field?
    alpha particle.
  5. A gram of radioactive material has a
    half life of one year. After 4 years, how much radioactive material will be left?
    1/16
  6. When the hydrogen isotope tritium 3 emits a beta particle, it becomes an isotope of...
    helium.
  7. When a nucleus emits a beta particle, it's atomic number...
    increases by 1.
  8. Which body is heated in it's interior by nuclear processes...
    the sun and Earth.
  9. The helium in a child's balloon is composed of...
    alpha particle remnants of previous radioactive processes and former beta particles.
  10. The most harmful radiaitons are those that...
    damage living cells.
  11. The amount of radiation we personally encounter that originates in the Earth's and the atmosphere's natural background is...
    more than half.
  12. All deposits of natural uranium contain appreciable amounts of...
    lead.
  13. Carbon 14 is produced in the atmosphere principally by...
    cosmic ray bombardment.
  14. (blank) is a radioactive isotope.
    Carbon 14
  15. The high temperature of the Earth's interior is due mostly to...
    radioactivity.
  16. When a gamma ray is emitted by a nucleus, the nucleus then has appreciably less...
    neither mass nor charge.
  17. When an beta particle is ejected from a nucleus, the nucleus then has a greater...
    charge.
  18. When an element undergoes nuclear transmutation, the result is a completly different...
    element.
  19. The half life of a radioactive substance is INDEPENDENT of...
    the number, if large enough, of atoms in the substance; whether the substance exists in an elementary state or in a compound; the temp of the substance and the age of the substance.
  20. The half-life of an isotope is one day. At the end of two days the amount that remains is...
    one-quarter.
  21. Electric forces within an atomic nucleus tend to...
    push it apart.
  22. Different isotopes of an element have different numbers of...
    neutrons.
  23. Deuterium and tritium are both....
    forms of hydrogen and isotopes of the same element.
  24. The atomic number of an element is thesame as the number of its...
    protons.
  25. A nucleon is either...
    a proton or a neutron.
  26. Xrays are most similar to...
    gamma rays.

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