Two identical blocks of metal are at 20∘C and 80∘C, respectively. The specific heat of the material of the two blocks increases with temperature. Which of the following is true about the final temperature Tf when the two blocks are brought into contact (assuming that no heat is lost to the surroundings)?
Tf will be 50∘C
Tf will be more than 50∘C
Tf will be less than 50∘C
Tf will be more than or less than 50∘C depending on the precise variation of the specific heat with temperature.
A
Tf will be less than 50∘C
B
Tf will be more than or less than 50∘C depending on the precise variation of the specific heat with temperature.
C
Tf will be 50∘C
D
Tf will be more than 50∘C
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Solution
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Final temperature will be more than 50oC as because the specific heat of the block at higher temperature is less than that of at lower temperature. And hence it will release less heat and less heat is being absorbed.
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