Q 1530101012.     A black body calorimeter filled with hot water cools
from `60^oC` to `50^oC` in `4` min and `40^oC` to `30^oC` in
`8` min. The approximate temperature of surrounding
is

A

`10^oC`

B

`15^oC`

C

`20^oC`

D

`25^oC`

HINT

`(theta_1 - theta_2)/t = alpha [(theta_1 - theta_2)/2 - theta_0]`
0
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