Question

Give reason:The expansion of a hollow copper rod is lesser than that of a solid copper rod.​

Answer 1

Answer:

Explanation:

When two identical rods (same length ) are of different material and heated to same rise in temperature, the copper rod will expand more than iron, since expansion depends on nature of material.

(Coefficient of linear expansion of copper 17×10

−6

 per  

∘

C> iron 13×10

−6

 per  

∘

C)

Answer 2

They will expand by the same amount.

To understand why, you can consider the solid rod to be a number of nested hollow rods. Each of these hollow rods will expand by the same ratio. If you take the limit as the number of hollow rods approach infinity and the thickness of each approaches zero, you will get the solid rod.