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JAMB Physics 1982 Question 22

Question 22

Thermal Expansion

A rod of length 10 cm is heated through 100°C and its final length is 10.26 cm. What is the co-efficient of linear expansion of the rod?

  1. A.0.026 per degree centigrade
  2. B.0.00026 per degree centigrade
  3. C.0.26 per degree centigrade
  4. D.1.0026 per degree centigrade
  5. E.0.0026 per degree centigrade.
Show the answer and explanation

Answer: B (0.00026 per degree centigrade)

Explanation

α = increase in length ÷ (original length × temperature rise) = 0.26/(10 × 100) = 0.00026 per °C.