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A pendulum clock keeps correct time at 20°C. The correction to be made during summer per day, where the average temperature is 40°C, will be :
$(α = 10^{- 5} /^{o} C)$

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5.64 sec

6.64 sec

7.64 sec

8.64 sec

answer is D.

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Detailed Solution

Per day time loss $= \frac{1}{2} α . Δθ \times 86400 \sec .$

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