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ff the work done in blowing a bubble of radius R is \W, then the work done in blowing a bubble of radius 2R from that solution is : |
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Answer» W/2 `thereforeW_(1)=T.2[4piR^(2)-0]` `W_(1)=8piR^(2)T.` & `W_(2)=T.2[4pi(2R)^(2)-0]` `=32piR^(2)T.` `THEREFORE(W_(2))/(W_(1))=(32piR^(2)T)/(8piR^(2)T)RARR(W_(2))/(W_(1))=4` `rArrW_(2)=4W_(1)` Thus correct choice is (c). |
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