Question on: JAMB Physics - 2007
A blacksmith heated a metal whose cubic expansivity is 6.3 x 10-6K-1. The areal expansivity is
A
2.0 x 10-6K-1
B
2.1 x 10-6K-1
C
4.2 x 10-6K-1
D
6.3 x 10-6K-1
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Correct Option: C
If the lineal expansivity = ∝
=> area expansivity β= 2∝.
And cubic expansivity δ = 3∝.
=> 6.3 x 10-6 = 3∝
∴ ∝ =
∴ Area = 2∝ = 2 x 2.1x10-6
= 4.2 x 10-6K-1
=> area expansivity β= 2∝.
And cubic expansivity δ = 3∝.
=> 6.3 x 10-6 = 3∝
∴ ∝ =
| ∴ ∝ = | 6.3 x 10-6 | = 2.1x 10-6 |
| __3 |
∴ Area = 2∝ = 2 x 2.1x10-6
= 4.2 x 10-6K-1
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