Q.

A clock with a metal pendulum beating seconds keeps correct time at 0°C. If it loses 12.5 s a day at 25°C, the coefficient of linear expansion of metal pendulum is

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a

186400/C  ∘

b

143200/C  ∘

c

114400/C  ∘

d

128800/C  ∘

answer is A.

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Detailed Solution

Number of seconds lost in a day,  Δt=12αΔθ×86400The coefficient of linear expansion of metal pendulum,                        α=2ΔtΔθ×86400=2×12.525×86400⇒               α=186400/C  ∘
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