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Question
Choose the correct option.
Water falls from a hight of 200 m. What is the difference in temperature between the water at the top and bottom of a waterfall given that the specific heat of water is 4200 J kg-1 °C-1?
Options
0.96° C
1.02° C
0.46° C
1.16° C
Solution
0.46° C
Explanation:
The potential energy at height = kinetic energy at bottom Assuming all kinetic energy is converted into heat, Let ΔT be the rise in temperature of water observed at the bottom
∴ mgh = m s ΔT
∴ ΔT = `"gh"/"s" = (9.8 xx 200)/4200 = 0.467^circ`C
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