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"Two metallic spheres" `S_(1) "& "S_(2) "area made of same material /The mass of" S_(1) "Is thrice that of" S_(2) "Both of the spere are heated to the same temp and placed in the same ambient .Ratio of initial rate of cooling of" S_(1) "to that of" S_(2)`A. `1/3`B. `(1)/(sqrt(3))`C. `(1)/(sqrt(3)^(1//3))`D. `(1)/(sqrt(3)^(2//3))` |
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Answer» Correct Answer - 3 `R_(c)propto (A)/(mS)` `R_(c) propto (4pir^(2))/((4)/(3)pir^(3)ds)` `R_(c) propto (1)/(rds)` `m_(1)=3 m_(2)` `(4)/(3)pir_(1)^(3)d=(4)/(3)pi_(3)^(3)dx3` `r_(1)=3^(1/3)r_(2)` `R_(c) propto 1/r` `(R_(C_(1)))/(R_(C_(2)))=(r_(2))/(r_(1))=(1)/(3^(1/3))` |
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