The surface tension of soap solution is ` 2.1 xx 10^(-2)` N/m . Then the work done in blowing a soap bubble of diameter 3.0 is
The surface tension of soap solution is ` 2.1 xx 10^(-2)` N/m . Then the work done in blowing a soap bubble of diameter 3.0 is
A. `4.4 xx10^(-5)`J
B. `11.9 xx 10^(-5)`J
C. `8.95 xx 10^(-5)`J
D. `23.10^(-5)`J
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Correct Answer - B
`W = Txx2A`
` = 2.1 xx 10^(-2) xx 2xx 4 xx3.14 xx2.25 xx10^(-4)`
` = 11.9 xx 10^(-5)` J
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