Three very large plates of same area are kept parallel and close to each other. They are considered as ideal black surface and have very high thermal conductivity The first and third plates are maintained at temperatures `2T` and `3T` respectively Find the temperature of the middle (i.e second) plate under steady state .

Options

A. `((65)/(2))^(1//4)` T
B. `((97)/(4))^(1//4)`T
C. `((97)/(2))^(1//4)`T
D. `(97)^(1//4)`T

Answer

C

Explanation

Under steady conditions, the heat gained per second by a plate is equal to the heat released per second by the plate.

`("Heat gained")/("Second")`[by(2) from (1)]`+("Heat gained")/("Second")`
[by (2) from (3)] `=("Heat gained")/("Second") ` (by 2)
`therefore sigma A(2T)^(4)+sigmaA(3T)^(4)=sigma(2A)(T.)^(4)`
`therefore T.=[(97)/(2)]^(1//4)T`