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JAMB Physics 1995 Question 19

Question 19

Thermal Expansion

A rectangular metal block of volume 10−6 m3 at 273 K is heated to 573 K. If its coefficient of linear expansion is 1.2 × 10−5 K−1, the percentage change of its volume is

  1. A.1.5%
  2. B.1.1%
  3. C.0.4%
  4. D.0.1%
Show the answer and explanation

Answer: B (1.1%)

Explanation

Cubic expansivity = 3 × 1.2 × 10−5 = 3.6 × 10−5 K−1. Fractional change = 3.6 × 10−5 × 300 = 0.0108, about 1.1%.