A platinum-resistance thermometer has a resistance of 5Ω at 0°C and 9Ω at l00°C. Assuming that resistance changes uniformly with temperature, calculate the resistance of the thermometer when the temperature is 45°C.
A. 13.9 Ω
B. 8.9 Ω
C. 6.8 Ω
D. 3.2 Ω
E. 1.8 Ω
Correct Answer:
Option C – 6.8 Ω
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