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Standard XII

Physics

Heat

Two identical...

Question

Two identical blocks of metal are at $20^{\circ} C$ and $80^{\circ} C$ , respectively. The specific heat of the material of the two blocks increases with temperature. Which of the following is true about the final temperature $T_{f}$ when the two blocks are brought into contact (assuming that no heat is lost to the surroundings)?

T_{f}

will be

50^{\circ} C

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T_{f}

will be more than

50^{\circ} C

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T_{f}

will be less than

50^{\circ} C

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T_{f}

will be more than or less than

50^{\circ} C

depending on the precise variation of the specific heat with temperature.

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Solution

The correct option is B $T_{f}$ will be more than $50^{\circ} C$
Final temperature will be more than $50^{o} C$ 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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The correct option is B Tf will be more than 50∘CFinal 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.

The correct option is B $T_{f}$ will be more than $50^{\circ} C$
Final temperature will be more than $50^{o} C$ 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.