# A clock which keeps correct time at $\;20^{0}C\;$ . How many seconds will it gains or loss per day when the temperature falls to $\;0^{0}C\;$ ? ( Coefficient of linear expansion of brass = $\;12\times 10^{-6}/^{0}C\;$ )
$(a)\;10.36\;sec\qquad(b)\;9.86\;sec\qquad(c)\;15.6\;sec\qquad(d)\;13.38\;sec$