InterviewSolution
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InterviewSolution
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The following observations were taken for dtermining the surface tension of water by capillary tube method: diameter of capillary , `D = 1.25 xx 10^(-2) m` and rise of water in capillary , `h = 1.45 xx 10^(-2) m`. Taking ` g = 9.80 m s^(-2)` and using the relation `T = ( r gh//2) xx 10^(3) N m^(-1)`, what is the possible error in measurement of surface tension `T`? (a) `2.4%` (b) `15%` (c) `1.6%` (d) 0.15%`A. 0.0016B. 0.016C. 0.16D. 0.024 |
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Answer» Correct Answer - B `T=(rhg)/(2)rArr(DeltaT)/(T)=(Deltar)/(T)=(Deltah)/(h)+(Deltag)/(g)` `(DeltaT)/(T)xx100=((0.01xx10^(-2))/(1.25xx10^(-2))+(0.01xx10^(-2))/(1.45xx10^(-2))+(0.01)/(9.80))xx100` `=0.80+0.69+0.10=1.59%=1.6%` |
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