24. The work done in blowing a soap bubble of 10 cm

radius is (Surface tension of the soap solution is (3/100) N/m) (a)   75.36 x 10-4 joule (b) 37.68 x 10-4 joule (c) 150.72 x 10-4 joule (d)  75.36  joule Ans. a (10)