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Question

A clock which keep correct time at 20 C is subjected to 40 C. If coefficient of linear expansion of the pendulum is 12×106/C. How much will it gain or loss time?



A

10.3 s/day

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B

20.6 s/day

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C

5 s/day

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D

20 min/day

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Solution

The correct option is C

10.3 s/day


T=2πlg

ΔTT=12Δll=12α(ΔT)

=12×12×106×(4020)

ΔT=24×60×60×12×105=10.3 s/day


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