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

Options

A. `16/3R`
B. `2R`
C. `3R`
D. `2/3R`.

Answer

A

Explanation

`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).