AP EAMCET · PHYSICS · Mechanical Properties of Fluids
The surface tension and vapour pressure of a liquid at \(25^{\circ} \mathrm{C}\) are \(8 \times 10^{-2} \mathrm{Nm}^{-1}\) and \(2.5 \times 10^3 \mathrm{~Pa}\) respectively. The radius of the smallest spherical water droplet which can from without evaporating at \(25^{\circ} \mathrm{C}\) is
- A \(64 \mu \mathrm{m}\)
- B \(30 \mu \mathrm{m}\)
- C \(60 \mu \mathrm{m}\)
- D \(32 \mu \mathrm{m}\)
Answer & Solution
Correct Answer
(A) \(64 \mu \mathrm{m}\)
Step-by-step Solution
Detailed explanation
The drop will evaporate if the water pressure is greater than the vapour pressure \(\mathrm{P}\). As \(\mathrm{P}=\frac{2 \mathrm{~S}}{\mathrm{R}}\), where \(\mathrm{R}=\) radius of drop…
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