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Thermal Expansion of Solids

Why is invar ...

Question

Why is invar used in making a clock pendulum?

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Solution

Invar is an alloy which has a small coefficient of linear expansion. The length of a pendulum made of invar does not change with temperature and hence the time period of oscillation remains the same. Hence the time shown by the clock is accurate.

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The pendulum used in a clock is a___pendulum.

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