Question

The resistance of a platinum resistance thermometer of ice point, the steam point and the boiling point of sulphur are 2.50, 3.50 and 6.50$\Omega$ respectively. Find the boiling point of sulphur on the platinum scale. The ice point and steam point measure $0^{\circ }$ and ${100}^{\circ }$ respectively.

• A. ${400}^{\circ }$
• B. ${500}^{\circ }$
• C. ${600}^{\circ }$
• D. ${700}^{\circ }$

Answer 1

The correct option is A ${400}^{\circ }$

$t=\frac{R_t-R_0}{R_{100}-R_0}\times 100=\frac{6.5-2.50}{3.5-2.50}\times {100}^{\circ }$
$\Rightarrow t={400}^{\circ }$
Temperature is equal to $\%$ increase of the quantity it is related to.