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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?
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उत्तर
- Heat is transferred from the object at higher temperature to the object at lower temperature.
- We learn the principle of heat exchange from this process.
- Principle of heat exchange states that the heat energy lost by hot object is always equal to heat gained by cold object provided that the system of both the objects is isolated.
- The specific heat of an object can be measured using this principle.
संबंधित प्रश्न
What do you mean by the following statement?
The heat capacity of a body is 50 JK-1?
Two metallic blocks P and Q of masses in ratio 2: 1 are given the same amount of heat. If their temperature rise by the same amount, compare their specific heat capacities.
Discuss the role of high specific heat capacity of water with reference to climate in coastal areas.
Solve the following problems:
Equal heat is given to two objects A and B of mass 1 g. Temperature of A increases by 3°C and B by 5°C. Which object has more specific heat? And by what factor?
The ratio of specific heat capacity to molar heat capacity of a body _____________ .
Indian style of cooling drinking water is to keep it in a pitcher having porous walls. Water comes to the outer surface very slowly and evaporates. Most of energy needed for evaporation is taken from the water itself and the water is cooled down. Assume that a pitcher contains 10 kg of water and 0.2 g of water comes out per second. Assuming no backward heat transfer from the atmosphere to the water, calculate the time in which the temperature decrease by 5°C. Specific heat capacity of water = 4200 J kg−1 °C−1 and latent heat of vaporization of water = 2.27 × 106 J kg−1.
State, with reason, which of the two, boiling water or steam both at 100°C will produce more severe burns.
What is heat? What is the S. I. unit of heat?
Write two advantages of high specific heat capacity of water.
Write the approximate values of the specific latent heat of vaporization of steam.
Will the value of specific heat’capacity and specific latent heat of a substance change if the scale is °F instead of °C?
Calculate the ratio of two specific heats of polyatomic gas molecules.
What is specific heat capacity?
Numerical Problem.
What is the heat in joules required to raise the temperature of 25 grams of water from 0°C to 100°C? What is the heat in Calories? (Specific heat of water = `(4.18"J")/("g"°"C")`
If 'Cp' and 'Cv' are molar specific heats of an ideal gas at constant pressure and volume respectively. If 'λ' is the ratio of two specific heats and 'R' is universal gas constant then 'Cp' is equal to ______.
Specific heat capacity C = ______.
To study energy exchange between hot and cold objects, the system of both objects is isolated from the environment by keeping them inside ______.
Two blocks P and Q of different metals having their mass in the ratio 2 : 1 are given same amount of heat. Their temperature rises by same amount. Compare their specific heat capacities.
