Question Detail
Question
A capillary tube of 0.05 cm bore stands vertically in a wide vessel containing a liquid. The liquid has a surface tension of 30 dyne/cm and a specific gravity of 0.8. The liquid wets the tube. Which of the following values is needed to calculate the rise of the liquid?
Correct Answer
Option C is the correct answer.
Detailed Explanation
The capillary rise formula is h = (2γ cosθ) / (ρ g r). The problem provides bore (diameter), surface tension γ, specific gravity (to find density ρ), and states the liquid wets the tube (so θ = 0°). To calculate h, the value of acceleration due to gravity g is required. In CGS units, a standard value like 980 cm/s² would be used.
Hint
Review the capillary rise formula. All variables except one are given or implied. What physical constant is missing?