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प्रश्न
How will you prove experimentally that different substances have different specific heat capacities?
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उत्तर
Experiment to prove different substances have different specific heat capacities:
- Take three balls of iron, copper, and lead of equal mass and put them in boiling water for some time. Then, take them out of the water and measure their temperature.
- All of them will be at temperature 100oC. Now, put them immediately on the thick slab of wax. Note the depth that each of the balls goes into the wax. The ball which absorbs more heat from the water will give more heat to wax. More wax will thus melt and the ball will go deeper into the wax. It will be observed that the iron ball goes deepest into the wax. The lead ball goes the least and the copper ball goes to intermediate depth. This shows that for the equal rise in temperature, the three balls have absorbed different amounts of heat.
- This means that the property which determines the amount of heat absorbed by a ball is different for the three balls. This property is called the specific heat capacity.
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संबंधित प्रश्न
The coolant in a chemical or a nuclear plant (i.e., the liquid used to prevent the different parts of a plant from getting too hot) should have high specific heat.
Ice cream appears colder to the mouth than water at 0℃. Give reason.
Read the following paragraph and answer the questions.
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.
i. Heat is transferred from where to where?
ii. Which principle do we learn about from this process?
iii. How will you state the principle briefly?
iv. Which property of the substance is measured using this principle?
The ratio of specific heat capacity to molar heat capacity of a body _____________ .
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?
A piece of iron of mass 2.0 kg has a heat capacity of 966 J K-1. Find its specific heat capacity in S.I unit.
What are the factors on which the quantity of heat given to a body depends?
The farmers fill their fields with water in winter. Give reason.
A certain amount of heat Q will warm 1 g of material X by 3°C and 1 g of material Y by 4°C. Which material has a higher specific heat capacity?
Derive an expression for finding out the specific heat capacity of a body (solid) from the readings of an experiment given below:
(i) Mass of empty calorimeter (with stirrer) = m1 gm
(ii) Mass of the metal piece = M gm
(iii) Mass of colorimeter and water = m2 gm
(iv) Initial temperature and water = t1°C
(v) Temperature of hot solid (metal piece) = t2 °C
(vi) Final temperature of the mixture = t°C
(vii) Specific heat of calorimeter = 0.4 J gm / °C
Answer the following question.
Why do we generally consider two specific heats of a gas?
All metals have the same specific heat capacity.
What is specific heat capacity?
Which of the substances P, Q, or R has the lowest specific heat? The temperature v/s time graph is shown ______.
On supplying 100 µC of charge to a conductor, its potential rises by 5 V then capacity of the conductor is ______.
Water has the lowest specific heat capacity.
The specific heat capacity of ______ is maximum.
When two kilocalories of heat are supplied to a system, the internal energy of the system increases by 5030 J and the work done by the gas against the external pressure is 3350 J. Calculate J, the mechanical equivalent of heat.
