Question:
A pendulume clock loses $12 \mathrm{~s}$ a day if the temperature is $40^{\circ} \mathrm{C}$ and gains $4 \mathrm{~s}$ a day if the temperature is $20^{\circ} \mathrm{C}$. The temperature at which the clock will show correct time, and the coeffecient of linear expansion $(\alpha)$ of the metal of the pendulum shaft are respectively :-
Correct Option: 2,
Solution:
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