A copper ball of mass

Question:

A copper ball of mass $100 \mathrm{gm}$ is at a temperature T. It is dropped in a copper calorimeter of mass $100 \mathrm{gm}$, filled with $170 \mathrm{gm}$ of water at room temperature. Subsequently, the temperature of the system is found to be $75^{\circ} \mathrm{C}$. $\mathrm{T}$ is given by:

(Given : room temperature $=30^{\circ} \mathrm{C}$, specific heat of copper $=0.1 \mathrm{cal} / \mathrm{gm}^{\circ} \mathrm{C}$ )

  1. $1250^{\circ} \mathrm{C}$

  2. $825^{\circ} \mathrm{C}$

  3. $800^{\circ} \mathrm{C}$

  4. $885^{\circ} \mathrm{C}$


Correct Option: , 4

Solution:

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