The length of mercury thread when it is at 0°C, 100°C and at an unknown...
PHYSICS
JAMB 1997
The length of mercury thread when it is at 0°C, 100°C and at an unknown temperature \(\theta\) is 25mm, 225mm and 175mm respectively. The value of \(\theta\) is
- A. 85.0oC
- B. 80.0oC
- C. 75.0oC
- D. 70.0oC
Correct Answer: C. 75.0oC
Explanation
\(\frac{175 - 25}{225 - 25} = \frac{x - 0}{100 - 0}\)
\(\frac{150}{200} = \frac{x}{100}\)
\(x = \frac{150 \times 100}{200}\)
= 75°C
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