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 B D. If L and C are respective values of latent heat and the specific heat of the liquid wax, the ratio L divided by 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 blank m i n equals m C left parenthesis 90 minus 80 right parenthesis
    In 4 blank m i n comma blankheat supplied equals 2 m C open parentheses 90 minus 80 close parentheses
    therefore 2 m blank C open parentheses 90 minus 80 close parentheses equals m L rightwards double arrow fraction numerator L over denominator C end fraction equals 20

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