Question Detail
Question
A bridge is 500 m long at 0°C. By how much will it expand when the temperature rises to 30°C? Take α = 12 × 10⁻⁶ /°C.
Correct Answer
Option B is the correct answer.
Detailed Explanation
ΔL = αLΔT = 12×10⁻⁶ × 500 × 30 = 0.18 m = 18 cm.
Hint
Use ΔL = αLΔT.