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Physics Nuclear Reactions etc

  1. Jul 12, 2011 #1
    i have 1-100 true n false and im complate stuck on these following please help me fast i have a exam tomarrow please!!!

    following are True or False.. please someone im new to this site

    37. gravitational forces are greater then electrical forces?

    38. nuclear forces must be stronger than electrical repulsive forces between nucleons in order to hold a nucleus togather?

    39. most nuclei are stable?

    40. in a stable nuclei the gravitational force betweem nucleons is sufficiently strong to overcome electrostatic repulsion?

    41. a radioactive atom of uranium divides into two particles which are about equally unstable?

    42. the two main fragments produced by nuclear fission have approximately the same mass?

    43. nuclear fission reaction is the opposite of the nuclear fusion reaction?

    44. on earth nuclear fission is necessary in order to trigger a nuclear fusion reaction?

    45. nuclei having large masses ( larger than 50 amu) contain many positive charges, and there fore cannot easily undergo fusion?

    46. radioactive cobalt is often used to kill cancer cells.?

    47. iodine 130 can be used to determine the size, location, and activity of the thyroid gland.?

    48. beta particles can supply power to remote locations.?

    49. radiation is used to cause genetic mutations in plant and animals.?

    50. nuclear fusion is used in the production of electrical power.?

    51. an ounce of uranium matter converted to energy in a nuclear reactor could produce as much electricity as could 200,000 pounds of coal.

    52. one of the biggest problems with nuclear enegery is the residual radioactivity of spent nuclear fuel.
    1. The problem statement, all variables and given/known data



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    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jul 12, 2011 #2
    36. True
    43. true
    46. true 47.true
    48.true
    49.true
    51. true

    still need help
     
  4. Jul 13, 2011 #3

    37. Completely False, electromagnetic forces are much more powerful than gravity. An example is that a small horseshoe magnet can suspend say a nail or paperclip, and overcomes the gravitational pull of the entire Earth.

    38. False, electromagnetic forces only apply on the atomic scale, nuclear forces hold together the quarks that make up the protons and neutrons in the nucleus. In this example, the two are unrelated.

    39. True, however all particles have a half life, most are just extremely long. Don't quote me on this though, I'm not exactly sure about that answer when you start dealing with isotopes.

    40. False, gravity is far too weak to overcome electrostatic repulsion, the strong nuclear force keeps the nucleons together.

    45. I think it may depend if it is an Ion, but most likely not, so this is true.

    46. True.

    49. It isn't "used" to cause mutagens in organic tissue, but that is a by-product of radiation exposure.

    50. True, however nuclear fusion isn't too advanced at this point in time to provide a practical amount of power.

    51. You'd have to calculate it, but if it was fully converted (which I don't think is possible) or I guess even partly converted to energy, then this is certainly true.

    52. True, radioactive waste is dangerous and environmentally hazardous.


    I hope I helped a little, correct me if I'm wrong with any of these.
     
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