Properties of matterHard
Question
Work done in increasing the size of a soap bubble from a radius of 3 cm to 5 cm is nearly (Surface tension of soap solution = 0.03 Nm-1) :
Options
A.0.2 π mJ
B.2 π mJ
C.0.4 π mJ
D.4 π mJ
Solution
W = T × ᐃA = T × 8π (r22-r12) = 0.4 π mJ
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