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JAMB Physics 1998 Question 18

Question 18

Thermal Expansion

The linear expansivity of brass is 2 × 10−5 °C−1. If the volume of a piece of brass is 15.00 cm3 at 0 °C, what is the volume at 100 °C?

  1. A.16.03 cm3
  2. B.16.00 cm3
  3. C.15.09 cm3
  4. D.15.03 cm3
Show the answer and explanation

Answer: C (15.09 cm3)

Explanation

Cubic expansivity = 3 × 2 × 10−5 = 6 × 10−5 °C−1. Increase = 15.00 × 6 × 10−5 × 100 = 0.09 cm3, so the volume is 15.09 cm3.