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1. |
If the surface tension of the soap bubble is 0.035 N/m, then the work done in blowing the soap bubble of radius 5 cm in the air is. |
A. | 220 mJ |
B. | 2.2 mJ |
C. | 22 mJ |
D. | 0.22 mJ |
Answer» C. 22 mJ | |