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: Option C
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