A clock while keeps correct time at 30^(...

A clock while keeps correct time at `30^(@)C` has a pendulum rod made of brass. The number of seconds it gains (or) looses per second when the temperature falls to `10^(@)C` is [`alpha` of brass `= 18 xx 10^(-6//@)C`]

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The correct Answer is:

gain of 16.42 s

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