Answer:
Step-by-step explanation:
The formula for determining the pressure inside a soap bubble is expressed as
Pi - Po = 4T/r
Where
Pi represents the pressure inside the bubble.
Po represents the pressure outside the bubble or the atmospheric pressure.
T represents the surface tension.
r represents radius of the bubble.
From the information given,
Diameter of bubble = 4mm. Converting to meters, it becomes
4/1000 = 0.004m
Radius of bubble = 0.004/2 = 0.002m
T = 2.8 × 10^-2N/m
Po = 1 × 10^5Nm^-2
Therefore,
Pi - 10^5 = 4 × 2.8 × 10^ -2/0.004
Pi - 10^5 = 28
Pi = 28 + 1 × 10^5 = 100028Nm^-2