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JAMB Physics 2007 Question 36

Question 36

Thermal Expansion

A blacksmith heated a metal whose cubic expansivity is 6.3 × 10−6 K−1. The real expansivity is

  1. A.6.3 × 10−6 K−1.
  2. B.4.2 × 10−6 K−1.
  3. C.2.1 × 10−6 K−1.
  4. D.2.0 × 10−6 K−1.
Show the answer and explanation

Answer: A (6.3 × 10−6 K−1.)

Explanation

For a solid, the cubic expansivity is its real expansivity (the real/apparent distinction applies to liquids in containers), so the real expansivity is 6.3 × 10−6 K−1.