Question

The amount of energy required to form a soap bubble of radius 2 cm from a soap solution is nearly: (surface tension of soap solution = 0.03 Nm-1)

• A. 50.1 x 10-4 J
• B. 30.16 x 10-4 J
• C. 5.06 x 10-4 J
• D. 3.01 x 10-4 J

Answer 1

Answer: (D)

3.01 x 10-4 J

Answer 2

The correct option is (D): 3.01 x 10-4 J
$E=2T(4\pi R^2)$
$=2\times(0.03)(4)(3.14)(2\times 10^{-2})^2$
= 3.01 x 10-4 J