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प्रश्न
Specific heat capacity of substance A is 3.8 J g−1 K−1 whereas the specific heat capacity of substance B is 0.4 J g−1 K−1.
- Which of the two is a good conductor of heat?
- How is one led to the above conclusion?
- If substances A and B are liquids then which one would be more useful in car radiators?
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उत्तर
Given: Specific heat capacity of substance 3.8 J g−1 K−1
Specific heat capacity of substance B = 0.4 J g−1 K−1
(i) Substance B is a good conductor out of the two substances.
(ii) Substance B has a lower specific heat capacity than substance A. Therefore, it requires less heat to produce the same rise in temperature. However, specific heat capacity alone does not determine thermal conductivity.
(iii) Substance A would be more useful in car radiators because it has a higher specific heat capacity. It can absorb more heat for the same rise in temperature, helping to keep the engine cool.
संबंधित प्रश्न
Read the following paragraph and answer the questions.
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If heat is exchanged between a hot and cold object, the temperature of the cold object goes on increasing due to gain of energy and the temperature of the hot object goes on decreasing due to loss of energy. The change in temperature continues till the temperatures of both the objects attain the same value. In this process, the cold object gains heat energy and the hot object loses heat energy. If the system of both the objects is isolated from the environment by keeping it inside a heat resistant box (meaning that the energy exchange takes place between the two objects only), then no energy can flow from inside the box or come into the box. |
- Heat is transferred from where to where?
- Which principle do we learn about from this process?
- How will you state the principle briefly?
- Which property of the substance is measured using this principle?
Figure shows a paddle wheel coupled to a mass of 12 kg through fixed frictionless pulleys. The paddle is immersed in a liquid of heat capacity 4200 J K−1 kept in an adiabatic container. Consider a time interval in which the 12 kg block falls slowly through 70 cm. (a) How much heat is given to the liquid? (b) How much work is done on the liquid? (c) Calculate the rise in the temperature of the liquid neglecting the heat capacity of the container and the paddle.
A substance is heated at a constant rate from a low temperature to a high temperature. A graph of temperature against time is shown in the figure. Which part or parts of the graph correspond(s) to the substance existing in two states?
Explain, why temperature in hot summer, falls sharply after a sharp shower?
An equal quantity of heat is supplied to two substances A and B. The substance A shows a greater rise in temperature. What can you say about the heat capacity of A as compared to that of B?
1 kg of water freezes to form ice at 0°C. What amount of heat is withdrawn?
Describe a method to determine the specific heat capacity of a solid (say, a piece of copper).
Discuss how high specific heat capacity of water helps in formation of land and sea breeze.
The SI unit of specific heat is _______.
Which of the substances P, Q, or R has the lowest specific heat? The temperature v/s time graph is shown ______.
