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A spherical black body of radius r radia...

A spherical black body of radius `r` radiates power `P`, and its rate of cooling is `R`
(i)`P prop r`
(ii)`P prop r^(2)`
(iii)`R prop r^(2)`
(iv)`R prop (1)/(r)`

A

`P prop r`

B

`P prop r^(2)`

C

`R prop r^(2)`

D

`R prop(1)/(r )`

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