Q.

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/oC

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a

5.64 sec

b

6.64 sec

c

7.64 sec

d

8.64 sec

answer is D.

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Detailed Solution

Per day time loss = 12 α  .   Δθ  ×  86400   sec.
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