Question

A Centigrade and a Fehrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140° . What is the fall in temperature as registered by the Centigrade thermometer

Moderate

Solution

$\frac{F - 32}{180} = \frac{C - 0}{100}$
initial temperature = $100^{0} c$ = $t_{1}$
final temperature= $140^{0} F = t_{2}$ = $60^{0} c$
fall in temperature= $40^{0} c$

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