A body takes, 4 minutes to cool from `100^(@)C` to `70^(@)C`, if the room temperature is `25^(@)C`, then the time taken to cool from `70^(@)C` to `40^
A body takes, 4 minutes to cool from `100^(@)C` to `70^(@)C`, if the room temperature is `25^(@)C`, then the time taken to cool from `70^(@)C` to `40^(@)C` will be
A. 10 minute
B. 3 minute
C. 6 minute
D. 8 minute
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Correct Answer - D
`(d theta)/(dt)=k(theta_(AV)-theta_(0))`
`(30)/(4)=k(85-25)`
`(30)/(dt)=k(55-25)`
`dt=8`
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