JAMB - Physics (1979 - No. 11)
The heights of the mercury thread in a mercury-in-glass thermometer when in melting ice and then in steam are 3cm and 18cm respectively. At a temperature of 60oC the height would be
7.5cm
9cm
10.8cm
12cm
12.6cm
ব্যাখ্যা
18cm .... 100oC
x .... 60oC
3cm .... 0oC
\(\frac{x - 3}{18 - 3}\) = \(\frac{60 - 0}{100 - 0}\)
= 12cm
x .... 60oC
3cm .... 0oC
\(\frac{x - 3}{18 - 3}\) = \(\frac{60 - 0}{100 - 0}\)
= 12cm