Q147 / 160 · WBJEE 2009 · Physics

The height of a waterfall is $50 \mathrm{~m}$. If $g=9.8 \mathrm{~ms}^{-2}$ the difference between the temperature at the top and the bottom of the waterfall is:

A
$1.17^{\circ} \mathrm{C}$
B
$2.17^{\circ} \mathrm{C}$
Correct answer
C
$0.117^{\circ} \mathrm{C}$
D
$1.43^{\circ} \mathrm{C}$

Solution

$\frac{m g h}{J}=m s \Delta t \Rightarrow \Delta t=0.117^{\circ} \mathrm{C}$

Hence, the correct answer is option: 'C'.

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