A metal rod has a length of 100cm at 200℃. At what temperature will its length be 99.4cm if the linear expansivity of the material of the rod is 2×10^(-5) C^(-1)
- A. 200℃
- B. 300℃
- C. 100℃
- D. -100℃
Now for the right answer to the above question:
- Option A is incorrect.
- Option B is incorrect.
- C is incorrect. be careful with how you handle your signs.
- D is the correct answer.
You may please note these/this:
- Even without going into detailed solution, you should know that the answer must be negative since the rod actually contracted and did not expand.
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/ culled from 2019 JAMB-UTME physics question 4 /