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JAMB Physics 1993 Question 15

Question 15

Thermal Expansion

A metal rod 800mm long is heated from 10°C to 95°C. If it expands by 1.36mm, the linear expansivity of the metal is

  1. A.2.0 × 102 K−1
  2. B.2.0 × 10−2 K−1
  3. C.5.0 × 10−3 K−1
  4. D.2.0 × 10−5 K−1
Show the answer and explanation

Answer: D (2.0 × 10−5 K−1)

Explanation

α = extension ÷ (original length × temperature rise) = 1.36 ÷ (800 × 85) = 2.0 × 10−5 K−1.