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NEET 2019 · Thermometry & Thermal Expansion

Thermometry & Thermal Expansion question from NEET 2019

Q59NEET 2019Medium

Thermometry & Thermal Expansion

A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is: ( $\alpha$ Cu = 1.7 × 10–5 K–1 and $\alpha$ Al = 2.2 × 10–5 K–1)

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Answer: (c)

The difference in length stays constant when expansions are equal: $L_{Cu}\alpha_{Cu}=L_{Al}\alpha_{Al}$ .
$L_{Al}=\frac{88\times1.7}{2.2}=68$ cm
So the answer is (c) 68 cm.

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