JAMB Physics 2007 Objective — Question 36

Question 36 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2007 Objective paper, with the correct answer and a full explanation.

If the cubic expansivity of a metal is 6.3x10^-6 K-1, its area (superficial) expansivity is

A. 6.3x10^-6 K-1
B. 4.2x10^-6 K-1Correct
C. 2.1x10^-6 K-1
D. 2.0x10^-6 K-1

Explanation

Cubic expansivity (gamma) = 3 x linear expansivity (alpha), and area expansivity (beta) = 2 x alpha. So beta = (2/3) x gamma = (2/3) x 6.3x10^-6 = 4.2x10^-6 K-1.

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