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A body takes T minutes to cool from 62 C to61 C  when the surrounding temperature is 30 C .The time taken by the body to cool from 46 C  to 45.5 C is   
  1. Greater than T minutes
  2. Equal to T minutes
  3. Equal to T/2 minutes
  4. Less than T minutes


Solution

The correct option is B Equal to T minutes
In first step
6261T=K[62+61230]1T=K[31.5]  ....(i)
In second step, suppose process takes T min  then
4645.5T=K[46+45.5230]0.5T=K[15.75]    ...(ii)
On diving equation (i) and (ii) 2TT=2T=T
 

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