science homework

Discussion in 'Community Discussion' started by silentownage001, Jun 2, 2012.

  1. silentownage001, Jun 2, 2012
    Last edited: Jun 2, 2012

    silentownage001 macrumors regular

    Joined:
    Dec 1, 2011
    Location:
    NJ
    #1
    Hey guys, having trouble with my science homework and can't find the answers.

    First question
    When a human body is exposed to external nuclear radiation, the amount of tissue damage depends on the _________ power of the radiation.
    I have no idea

    Next question
    Although the fusion of hydrogen to produce helium is the most common fusion reaction occurring in the sun, several other fusion reactions occur. In one of these, two helium-4 nuclei fuse to form one unstable _____ nucleus.
    Is it beryllium-8?

    Last
    Why is the prefix halo used in halocarbon?
    Can't find the answer.

    I might have some more tomorrow.

    Thanks for any help.
     
  2. rockyroad55 macrumors 601

    rockyroad55

    Joined:
    Jul 14, 2010
    Location:
    Phila, PA
    #2
    All I know for the first one is: amount, time absorbed, and tissue susceptibility
     
  3. wordoflife macrumors 604

    wordoflife

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    Jul 6, 2009
  4. BreakGuy macrumors 6502a

    BreakGuy

    Joined:
    Nov 23, 2009
    Location:
    NZ, South Pacific
    #4
    Is Wikipedia down or something? :confused:

    Q2) The fusion of two helium-4 nuclei can only result in beryllium-8, but due to it being unstable, it doesn't last very long as beryllium-8.
     
  5. Study13 macrumors newbie

    Joined:
    May 28, 2012
    #5
    1. I think it's 'rem' or "roentgen equivalent in man".

    2. It is Beryllium-8.
     
  6. silentownage001 thread starter macrumors regular

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    Dec 1, 2011
    Location:
    NJ
    #6
    Hmm those don't really sound right with power in there.

    Nope wikipedia is up and I found beryllium-8 there I wanted to make sure since people change things. I know a few people who have.
     
  7. lls4f macrumors regular

    Joined:
    Apr 2, 2012
    Location:
    United States
    #7
    A halocarbon is a halogen atom (F, Br, I, Cl) added to a carbon atom. So a halocarbon = halogen + carbon.

    Not sure exactly what answer is needed for the first question, but I would guess "ionizing".

    And yes, it's beryllium-8
     
  8. silentownage001 thread starter macrumors regular

    Joined:
    Dec 1, 2011
    Location:
    NJ
    #8
    Thanks. Ionizing makes sense. I remember in my book it talked about Geiger-counters and the radiation ionizing the gas but it didn't hit me.

    I might have more tomorrow when I check my work. It is a long packet.
     
  9. miles01110 macrumors Core

    miles01110

    Joined:
    Jul 24, 2006
    Location:
    The Ivory Tower (I'm not coming down)
    #9
    "ionizing" (power) is not the correct answer for #1. It's probably "penetration" power.
     
  10. MasterHowl macrumors 65816

    MasterHowl

    Joined:
    Oct 3, 2010
    Location:
    North of England
    #10
    First question: ionising

    Next question: two helium-4 nuclei... that's two protons + two neutrons, times two... which gives four protons and four neutrons. Beryllium is element number four, and this particular isotope has eight nuclei, so yeah, it's Beryllium-8 (well done!)


    Last: chemistry isn't my strong spot (only did it up to AS level), but i suspect it's so we know which halogen is in the compound.

    Hope this helps!

    If you want a more in depth explanation of the first two, let me know.
     

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