A steel ruler exactly 20 cm long is graduated to give correct measurements at 20°C.
PHYSICS · Multi-part · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
A steel ruler exactly 20 cm long is graduated to give correct measurements at 20°C.
(a) Will it give readings that are too long or too short at lower temperatures?
(b) What will be the actual length of the ruler when it is used in the desert at a temperature of 40°C? αsteel=1.2×10−5 (∘C)−1 .