A clock with a metal pendulum beating seconds keeps correct time at 0°C . If it loses 12.5s a day at 25°C , the coefficient of linear expansion of metal pendulum is
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a
186400/0C
b
143200/0C
c
114400/0C
d
128800/0C
answer is A.
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Detailed Solution
Time loss (or) gain per day=12×αΔt×8640012.5=12×α×25×86400α=186,400/∘C
A clock with a metal pendulum beating seconds keeps correct time at 0°C . If it loses 12.5s a day at 25°C , the coefficient of linear expansion of metal pendulum is