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Root mean square velocity question

  1. Apr 18, 2013 #1
    If at 120 K the Vrms is v , then at 480 K it will be

    a. 1
    b. 2
    c. 3
    d. 4
    Which formula is to be used here? Plz solve this.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Apr 18, 2013 #2
    We don't solve anything here. We can help, but only if you show some effort.
     
  4. Apr 18, 2013 #3
    Ok.. but I couldnt understand it.. The formula mentioned in my book is Vrms= radical 3P/density so...What to do next?
     
  5. Apr 18, 2013 #4
    Are you saying there is no equation linking r. m. s. velocity and temperature that you know of?
     
  6. Apr 18, 2013 #5
    No.. Im not saying this.. This formula also shows relation with temperature but how to continue..?
     
  7. Apr 18, 2013 #6
    Perhaps you could express how pressure depends on temperature?
     
  8. Apr 18, 2013 #7
    Pressure has direct relation with temperature
     
  9. Apr 18, 2013 #8
    What is the equation?
     
  10. Apr 18, 2013 #9
    PV=nRT
     
  11. Apr 18, 2013 #10
    Use this and the equation given for r. m. s. velocity to relate the latter with T.
     
  12. Apr 18, 2013 #11
    Any clue?
     
  13. Apr 18, 2013 #12
    The clue is in #10. The rest is just algebra.
     
  14. Apr 18, 2013 #13
    ok.. Thank U
     
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