Question

The height of a waterfall is 50 $m$. If g =9.8 $m{s}^{-2}$, the difference between the temperature at the top and the bottom of the waterfall is

• A. ${1.17}^{o}C$
• B. ${2.17}^{o}C$
• C. ${0.117}^{o}C$
• D. ${1.43}^{o}C$

Answer 1

The correct option is C ${0.117}^{o}C$

Given,

$h=50m$

$g=9.8m/s^2$

The amount of energy is converted into heat,

$mgh=ms\Delta T$

$\Delta T=\frac{gh}{s}$

$\Delta T=\frac{9.8\times 50}{4200}={0.117}^{0}C$

The correct option is $C$.