A) \[5\,\,\Omega \]
B) \[4\,\,\Omega \]
C) \[3\,\,\Omega \]
D) \[2\,\,\Omega \]
Correct Answer: C
Solution :
Natural uranium has two isotopes 92U238 and 92 U235 in the ratio 145 : 1. It has been experimentally found that the fission of \[{{U}^{238}}\] takes place only by fast neutrons and that of \[{{U}^{235}}\] is possible by slow neutrons also. \[_{92}{{U}^{235}}{{+}_{0}}{{n}^{1}}{{\xrightarrow{{}}}_{92}}{{U}^{236}}\xrightarrow{{}}\] \[_{56}B{{a}^{144}}{{+}_{36}}K{{r}^{89}}+{{3}_{0}}{{n}^{1}}+\]energy. \[{{R}_{S}}={{R}_{1}}+{{R}_{2}}=R+R=2R\] Resistance increases twice, hence heat produced is halved. Therefore, \[{{Q}_{S}}=\frac{1000}{2}=500\] \[\Rightarrow \] \[\frac{{{Q}_{P}}}{{{Q}_{S}}}=\frac{2000}{500}=\frac{4}{1}\]
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