A clock with an iron pendulum keeps correct time at 15°C . If the coefficient of linear expansion of iron is 0.000012/0C and the room temperature is 20°C it loses in a day

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1.3 s

2.6 s

3.2 s

3.8 s

answer is B.

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Detailed Solution

Time lose = 12×αΔt×86,400=12×12×10−6×5×86,400=30×86,400×10−6=3×8.64×10−1= 2.6 sec

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