WAEC Physics 2016 Objective — Question 19
Question 19 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.
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19. An aluminium rod of length 1.8cm at 10°C is heated to produce a difference in length of 0.007 m. Calculate the temperature to which it is heated. (Linear expansivity of aluminium = 2.3×10⁻⁵ K⁻¹) A. 155°C B. 160°C C. 169°C D. 179°C
- A. 155°C
- B. 160°C
- C. 169°C
- D. 179°CCorrect
Explanation
Linear expansivity α=ΔL/(L×ΔT); (2.3×10⁻⁵×1.8)(T₂-10)=0.007 → T₂-10=169.08 → T₂=179°C.
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