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NEET2019PhysicsThermal Properties of MatterActual

A copper rod of 88   c m and an aluminum rod of unknown length have their increase in length independent of increase in temperature. The length of aluminum rod is α C u = 1.7 × 10 - 5   K - 1   a n d   α Al = 2.2 × 10 - 5   K - 1  

Options

  1. A6.8 c m
  2. B113.9 c m
  3. C88 c m
  4. D68 c m

Correct answer

D. 68 c m

Step-by-step solution

Increase in length is independent of temperature, L cu   α cu = L Al   α Al L Al = 88   c m 1.7 × 10 - 5 2.2 × 10 - 5 = 68   c m

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