The wire of a platinum resistance thermometer has d resistance of 3.5Ω at 0 °C and 10.52Ω at 100°C. Calculate the temperature of the wire when its resistance is 7.5Ω.

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A. 78 °C
B. 25 oC
C. 30oC
D. 57 oC

Correct Answer: Option D
Explanation
Using the formula

t = R−R0/R(100)−R0×100oC
t = 7.5−3.5/10.5−2..5×100oC
= 47×100
= 57.14oC

~ 57oC

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