Question

The specific heat capacity of a substance is the amount of heat required to raise the temperature of 1kg of the substance by 10C. The specific heat capacities of a few substances are also given here. Using this information, answer the question .If equal masses each of water, vegetable oil, aluminium and copper are heated uniformly for five minutes, which one of them will record the maximum rise in temperature?​

Answer 1

Answer:

Lead

Explanation:

We know,the greater the specific heat, the more heat energy is needed to increase the temperature of a substance. So, the substance with the least specific heat will have the maximum rise in temperature and vice-versa.Here,lead has the least specific heat so it will have the highest rise in temperature if all the substances are heated unifromly for five minutes.On the other hand, water having the highest specific heat will have the least rise in temperature.

Answer 2

Answer:

Copper will record the maximum rise in temperature.

Explanation:

The specific heat capacity of a substance is the amount of heat required to raise the temperature of 1kg of the substance by 1°C. i.e.,

$Q=ms\Delta T$                                                ...(1)

where s is the specific heat capacity.

Given the data of specific heat capacities of some substances.

Need to compare the specific heat capacities of water, vegetable oil, aluminum and copper.

$\begin{array}{cc}\mbox{substance}&\mbox{specific heat }\\&\bigg(\dfrac{J}{kg.^{o} C\times 1000} \bigg)\\\\\mbox{water}&4.18\\\mbox{vegetable oil}&1.96\\\mbox{aluminum}&0.90\\\mbox{copper}&0.38\end{array}$

From equation (1), the specific heat capacity can be written as

$s=\dfrac{Q}{m\Delta T}$

Given equal masses are taken and heated uniformly, thus m and Q are same, and hence,

$s\propto \dfrac{1}{\Delta T}$

So, the greater the specific heat, the lower the rise in temperature of a substance and vice-versa.

Here, among the four substances, water have the highest specific heat, therefore it will have the least rise in temperature.

And copper has the least specific heat, so copper will record the maximum rise in temperature.

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