A weight thermometer contains 52 gms of a liquid at 100C. When it is heated to 1100C, 2 gm of the liquid is expelled. The coefficient of real expansion of the liquid is [α of glass is 9×10−6/0C]
A
27×10−6/0C
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B
412×10−6/0C
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C
373×10−6/0C
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D
0
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Solution
The correct option is C412×10−6/0C Vexpelled=V0(γl−γg)ΔT ⇒2=52×(γl−3×αg)×(110−10) ⇒2=52×(γl−3×9×10−6)×100 ⇒γl=252×10−2+27×10−6=385×10−6+27×10−6=412×10−6