Question

30. The work done in blowing a soap bubble of 10 cm
radius is (surface tension of soap solution is
0.03 N/m).
37.68 x 10-4 J
(2) 75.36 x 10-4 J
(3) 126.82 x 10-4 J
(4) 75.36 x 10-3 J
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Answer 1

QUESTION

The work done in blowing a soap bubble of 10 cm

radius is (surface tension of soap solution is

0.03 N/m).

37.68 x 10-4 J

(2) 75.36 x 10-4 J

(3) 126.82 x 10-4 J

(4) 75.36 x 10-3 J

Answer:

The Work done is given as,

⇒W= 2 x 4πr² x T      (T here is tension)

⇒2×4π(10×10⁻²)²  ×0.03

⇒75.36×10⁻⁴  J

Thus, the work done is 75.36×10⁻⁴  J