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Physics Experiment Help please

  1. Aug 25, 2011 #1
    Alpha-particles (helium nuclei) from a particular radioactive source have range of about 6 or 7 cm in air. This is because the kinetic energy of the alpha-particles is continually being transferred to air molecules due to collisions between the alpha-particles and the air molecules.

    Design a laboratory experiment to investigate how the range of alpha-particles in air is affected by the air pressure. In your account it is expected that you will

    (a) draw a diagram showing how the apparatus would be used in your investigation,
    (b) explain clearly the procedure to be followed,
    (c) name the alpha-particle detector which you would use,
    (d) state any safety precautions which may need to be taken when performing the experiment.

    -----------------------------------------------------------------------------------------
    Perform experiment in closed container

    Use vacuum pump to reduce pressure
    (Do not allow 'climb mountains', 'use a helicopter' etc..
    A laboratory method must be employed)

    ('pressure gauge' shown) to measure air pressure

    Geiger-Müller tube stated as detector

    Diagram of apparatus
    Source/detector/rule/pressure gauge/closed container

    Any mention of compensating for background radiation
    No details required.

    Procedure to be followed
    Must be workable (e.g. move GM tube to point = background;
    reduce air pressure and move GM tube to position which gives
    the same count rate as before and measure distance)


    THE INFORMATION ABOVE THE DOTTED LINES WAS THE QUESTION GIVEN , THE INFORMATION BELOW IS WHAT I HAVE OBTAINED FROM MY UNDERSTANDING BUT STILL IM UNSURE OF MY CHOICES, ANY HELP WILL BE DEEPLY APPRECIATED


    << extraneous comment deleted by Moderators >>
     
    Last edited by a moderator: Aug 25, 2011
  2. jcsd
  3. Aug 25, 2011 #2

    berkeman

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    Staff: Mentor

    What are your thoughts so far? We will not design this experiment for you, but we should be able to answer specific questions once you post your thoughts on how to set up the experiment.

    I'm especially interested in how you plan to move things inside the vacuum chamber....
     
  4. Aug 25, 2011 #3
    cant you just use a syringe???
     
  5. Aug 25, 2011 #4

    berkeman

    User Avatar

    Staff: Mentor

    Use a syringe for what?
     
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