1.

The rate of cooling at 600 K, if surrounding tempearture is 300 K is R. The rate of cooling at 900 K is :

Answer»

`16/3R`
`2R`
`3R`
`2/3R`.

Solution :`Eprop(T^(4)-T_(0)^(4))`
`:.(E_(2))/(E_(1))=((900)^(4)-(300)^(4))/((600)^(4)-(300)^(4))`
`(E_(2))/(E_(1))=(9^(4)-3^(3))/(6^(4)-3^(4))=(16)/(3)rArrE_(2)=(16)/(3)E_(1)=(16)/(3)R`.
CORRECT CHOICE is (a).


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