Question

The surface tension of a soap solution is To blow a bubble of radius 1 cm, the work done is

• A. $4 \pi \times 10 ^ { - 6 } J$
• B. $8 \pi \times 10 ^ { - 6 } J$
• C.
• D.

Answer 1

Answer: (B)

$8 \pi \times 10 ^ { - 6 } J$

Answer 2

Surface energy of combined drop will be lowered, so excess surface energy will raise the temperature of the drop.