KVPY Sample Paper KVPY Stream-SX Model Paper-20

  • question_answer
    Consider the following reaction.
    \[_{92}^{235}U+_{0}^{1}n\xrightarrow{{}}_{32}^{83}Gc+_{60}^{153}Nd\]
    Now, the ratio of kinetic energies of \[Ge\] and \[Nd\] is

    A) \[83:153\]

    B) \[1:1\]    

    C) \[11:6\] 

    D) \[60:32\]

    Correct Answer: C

    Solution :

    Both kinetic energy and linear momentum are conserved.
    So,     \[K{{E}_{Ge}}+K{{E}_{Nd}}=0\] and  \[{{m}_{Ge}}{{v}_{Ge}}+{{m}_{Nd}}{{v}_{Nd}}=0\]
    Combining both, we get
    \[{{K}_{Ge}}=\left( \frac{{{m}_{Nd}}}{{{m}_{Nd}}+{{m}_{Ge}}} \right)\times Q\]
    \[{{K}_{Nd}}=\left( \frac{{{m}_{Ge}}}{{{m}_{Nd}}+{{m}_{Ge}}} \right)\times Q\]
    So, the ratio is \[\frac{{{K}_{Ge}}}{{{K}_{Nd}}}=\frac{{{m}_{Nd}}}{{{m}_{Ge}}}\]\[=\frac{153}{83}=\frac{11}{6}\]


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