The wire of a platinum resistance thermometer has d resistance of 3.5\(\Omega\) at 0 °C and...
PHYSICS
WAEC 2019
The wire of a platinum resistance thermometer has d resistance of 3.5\(\Omega\) at 0 °C and 10.52\(\Omega\) at 100°C. Calculate the temperature of the wire when its resistance is 7.5\(\Omega\).
- A.78 \(^o\)C
- B.25 \(^o\)C
- C.30\(^o\)C
- D.57 \(^o\)C
Correct Answer: D.57 \(^o\)C
Explanation
Using the formula
t = \(\frac{R - R_0}{R_{(100)} - R_0} \times 100^oC\)
t = \(\frac{7.5 - 3.5}{10.5 - 2..5} \times 100^oC\)
= \(\frac{4}{7} \times 100\)
= 57.14\(^o\)C
~ 57\(^o\)C
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