Physics-
General
Easy

Question

A block of steel heated to 100 degree C is left in a room to cool. Which of the curves shown in figure represents the correct cooling behaviour?

  1. A    
  2. B    
  3. C    
  4. D    

The correct answer is: B


    According to Newton’s law of cooling
    negative fraction numerator d theta over denominator d t end fraction equals K left parenthesis theta minus theta subscript 0 end subscript right parenthesis
    not stretchy integral fraction numerator d theta over denominator theta minus theta subscript 0 end subscript end fraction equals negative k t
    therefore theta equals theta subscript 0 end subscript plus A e to the power of negative k t end exponent

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