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Certain amount of heat is given to \( 100 \mathrm{~g} \) of copper to increase its temperature by \( 21^{\circ} \mathrm{K} \). If the same amount of heat is given to \( 50 \mathrm{~g} \) water, then the rise in its temperature is (specific heat capacity of copper \( =400 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1} \) and that of water \( =4200 \mathrm{Jkg}^{-1} \mathrm{~K}^{-1} \) )
(a) \( 4^{\circ} \mathrm{C} \)
(b) \( 5.25^{\circ} \mathrm{C} \)
(c) \( 8^{\circ} \mathrm{C} \)
(d) \( 6^{\circ} \mathrm{C} \)
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