F.3 phys. about heat,,10mkz!

2008-06-07 5:17 pm

Imagine you have a copper container and a silver container of the same mass. When equal amount of hot water is poured into the two containers , which one of them is more likely to gain a larger amount of energy? Explain your answer briefly. The specific heat capacities of copper and silver are 390 J kg^-1 度^-1 and 230 J kg^-1 度^-1 respectively.

and the answer is Copper...why?
isnt it the same?

回答 (1)

Gabriella Montez

2008-06-07 8:04 pm

✔ 最佳答案

Assume no energy loss to the surroundings, let the mass of both containers be m kg.
By the formula : E = mc△T, for the same temperature rise,
E( copper ) = m ( 390 )( △T )
= 390m△T J
E( silver ) = m ( 230 )( △T )
= 230m△T J
Hence E ( copper ) > E ( silver ).

2008-06-07 14:31:59 補充：
I think you want to ask: If water of same initial temperature is heated to the same final temp., which one will gain more energy? If so, then copper is the answer, as shown above.

2008-06-07 14:32:04 補充：
However, if it is not, then there will be no answers to the Q, as 2 variables exist:
1) △T of the containers
2) △T of the water

2008-06-07 14:32:55 補充：
So plx feel free to ask in case you are in doubt.

參考: My Phy Knowledge

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