Question

Surface Tension of the soap solution.

Answer 1

Surface tension is the property of a liquid by the virtue of which it tends to acquire the minimum possible surface area.

The surface tension of a soap solution can be found out by forming a bubble of from the soap solution.

The surface tension of the soap solution is lesser.

Answer 2

Work done in the film stretching,

W = S * delta A

Here S is surface tension and delta A is change in Area

Delta A = 100 cm^2 – 50 cm^ 2 = 50 cm^2

Work done, W = 3 * 10^-4 J

S = W/Delta A

S = 50/3 * 10^-4

S = 50 * 10^4 /3

S = 16.67 * 10^4

S = 166700 N/m