Saved Bookmarks
| 1. |
The pressure of air inside a soap bubble is 1mm of mercury greater than the atmospheric press ure.what is the diameter of the bubble surface tension=0.043N/m |
|
Answer» - 1 cmExplanation:Given:- A soap bubble, having radius of 1 mm, is blown from a detergent solution having a surface tension of 2.5 × 10–2 N/m. The pressure inside the bubble equals at a point Z0 below the FREE surface of water in a container. Taking g = 10 m/s2, density of water = 103 kg/m3, the value of Z0 isWe know that GUAGE pressure = ρgZo and excess pressure = 4 T /Rk + 4 T/R = k + ρ g Zo4 T / R = ρ g ZoZo = 4 T / R ρ GZO = 4 x 2.5 x 10^-2 / 10^-3 x 1000 x 10Zo = 10^-2Zo = 1 cm |
|