A piece of metal weighing 100 g is heated to 80o C and dropped into 1 kg of cold water in an insulated container at 15o C. If the final temperature of the water in the container is 15.69o C, the specific heat of the metal in J/go.C is:
A
0.38
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B
0.24
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C
0.45
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D
0.13
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Solution
The correct option is C0.45
Heat exchanged is given by,
Q=m×s×(T2−T1) where s= specific heat
So, when heated metal is dropped into the cold water, we can write: