Physics-
General
Easy

Question

The figure given below shows the cooling curve of pure wax material after heating. It cools from A to B and solidifies along BD. If L and C are respective values of latent heat and the specific heat of the liquid wax, the ratio L/C is

  1. 40    
  2. 80    
  3. 100    
  4. 20    

The correct answer is: 20


    Let the quantity of heat supplied per minute be Q. Then quantity of heat supplied in 2 min equals m C left parenthesis 90 minus 80 right parenthesis
    In 4 min, heat supplied equals 2 m C left parenthesis 90 minus 80 right parenthesis
    \ 2 m C left parenthesis 90 minus 80 right parenthesis equals m L Þ fraction numerator L over denominator C end fraction equals 20

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