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Nuclear reactor reaction

  1. Mar 11, 2015 #1
    Can someone please explain to me why the answer to the following question is Krypton? A step by step solution would be ideal please!

    (b)The following reaction occurs in a nuclear reactor:

    235U+01n →141Ba+X+301n+202.5MeV
    (i) Identify the element X.

    Many thanks!
    (Question is Q12 b part i from the 2010 Irish state physics exam http://examinations.ie/archive/exampapers/2010/LC021ALP000EV.pdf [Broken] )
     
    Last edited by a moderator: May 7, 2017
  2. jcsd
  3. Mar 11, 2015 #2
    What do you know about the problem? What have you tried?
     
  4. Mar 11, 2015 #3
    I initially took this approach;
    235 + 1 -141 -3(1) which is equal to 92. When I checked the answer this was incorrect. Then went down the route of converting the MeV to joules and subbing that value into the mass- energy equivalence formula in order to find the mass, and then using the unified atomic mass unit value (1.6605402x10^-27 kg) to try to find the element represented by the energy, at which point I got lost and have been unable to proceed further. Bear in mind I am 18 and studying for my Leaving Cert in Ireland (equivalent of SATs in US I think) so I am not at an advanced level
     
  5. Mar 11, 2015 #4

    mfb

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    Staff: Mentor

    Which number determines the chemical element?
     
  6. Mar 11, 2015 #5
    Do you guys just reply with questions? :P But yes I realised earlier that atomic number was the way to go, wasn't thinking straight, over complicated it. Many thanks ✌️
     
  7. Mar 11, 2015 #6

    mfb

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    2016 Award

    Staff: Mentor

    The idea is to help you to find the answer, and questions often work best.
     
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