Question

Q5) Calculate excess pressure of soap bubble of radius 4cm (surface tension = 0.025 N/m)

1 point

a) 5 N/m²

b) 10 N/m²

c) 1.25 N/m²

d) 2.5 N/m²​

Answer 1

Answer:

The excess pressure is calculated as ΔP=

r

4T

ΔP=

0.5×10

−2

4×25×10

−3

=20N/m

2

1Pa=1N/m

2

⇒ΔP=20Pa