A) \[{{0.23}^{o}}C\]
B) \[{{1.16}^{o}}C\]
C) \[{{0.96}^{o}}C\]
D) \[{{1.02}^{o}}C\]
Correct Answer: B
Solution :
Key Idea: Potential energy = increase in heat of water. From law of conservation of energy, we know that energy can neither be created nor destroyed, it remains conserved. When water falls from a height, it has potential energy\[(mgh)\], this is used in heating up the water\[(mc\Delta \theta )\]. Hence, we have \[mgh=mc\Delta \theta \] \[\Rightarrow \] \[\Delta \theta =\frac{gh}{c}\] \[=\frac{9.8\times 500}{4.2\times {{10}^{3}}}={{1.16}^{o}}C\]
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