A) 5 m
B) 10 m
C) 15 m
D) 20 m
Correct Answer: C
Solution :
\[{{P}_{1}}{{V}_{1}}={{P}_{2}}{{V}_{2}}\]Þ \[({{H}_{Hg}}{{\rho }_{Hg}}+{{H}_{W}}{{\rho }_{W}})V={{H}_{Hg}}{{\rho }_{Hg}}\times 3V\] Þ \[{{H}_{Hg}}{{\rho }_{Hg}}+{{H}_{W}}\frac{{{\rho }_{Hg}}}{10}=3{{H}_{Hg}}{{\rho }_{Hg}}\] Þ\[{{H}_{W}}=2{{H}_{Hg}}\times 10\]\[=\frac{2\times 75\times 10}{100}=15m\]
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