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Byju's Answer

Standard VII

Physics

Heat

A student too...

Question

A student took the following readings in an experiment to determine the linear expansivity of brass. Which readings are necessary?

Original length of brass rod

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Final length of brass rod

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Initial and final temperatures of rod

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Initial and final micrometer readings

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Solution

The correct option is D Initial and final micrometer readings
We know, coefficient of linear expansion $α = \frac{Δ l}{l_{0} Δ θ}$

where $Δ l =$ change in length measured by micrometer
$l_{0} =$ original length of rod
& $Δ θ =$ change in temperature for which initial and final temperature have to be measured.

Final length measurement is not required.
Hence, options (A), (C) and (D) are correct.

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