A pendulum clock is 5 seconds fast at temperature of 15 °C and 10 seconds slow at a temperature of 30 °C. Per day At what temperature does it give the correct time?
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a
18 °C
b
20 C
c
22 °C
d
25 °C
answer is B.
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Detailed Solution
As we knowΔTT=12αΔθ where Δθ=θactual −θcalibration So,510=T−1530−T⇒30−T=2T−30⇒T=20∘C