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  4. The number of neutrons emitted when 92235 U undergoes controlled nuclear fission to 54142 Xe and 3890 Sr is

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Q. The number of neutrons emitted when ${ }_{92}^{235} U$ undergoes controlled nuclear fission to ${ }_{54}^{142} Xe$ and ${ }_{38}^{90} Sr$ is______

JEE AdvancedJEE Advanced 2010

Solution:

${ }_{92} U ^{235} \rightarrow_{s 4} Xe ^{1+2}+{ }_{38} Sr ^{90}+3_{0} n ^{1}$