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PHYSICS

JAMB 2007 - Question 36

Physics 2007 JAMB Past Questions - Question 36: A blacksmith heated a metal whose cubic expansivity is 6.3 x10-k-¹ .The real expansivity is

Choose the correct answers from the options given.

A blacksmith heated a metal whose cubic expansivity is 6.3 x10-k-¹ .The real expansivity is

A: 6.3 x 10- K-¹.

B: 4.2 x 10-k-¹.

C: 2.1 x 10- K-¹.

D: 2.0x10-K-¹.

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Correct Answer

Explanation

If the lineal expansivity = ∝
=> area expansivity β= 2∝.
And cubic expansivity δ = 3∝.
=> 6.3 x 10-6 = 3∝

∴ ∝ = 6.3 x 10-6/3 = 2.1x 10-6

∴ Area = 2∝ = 2 x 2.1x10-6
= 4.2 x 10-6K-1