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प्रश्न
Write a short note.
Specific heat capacity
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उत्तर
- The amount of heat energy required to raise the temperature of a unit mass of an object by 1 °C is called the specific heat or specific heat capacity of that object.
- SI unit of specific heat capacity is J/kg °C and CGS unit is cal/g °C
- It is denoted by ‘c’ and given by formula: c = `"Q"/("m"Delta "T")`
- Specific heat is a property of a substance and is different for different substances.
- Higher the value of specific heat capacity of the substance, higher is the amount of heat energy required to raise its temperature by 1 °C.
- The specific heat capacity of object is measured using principle of heat exchange.
संबंधित प्रश्न
Define heat capacity and state its SI unit.
What do you understand by the following statements:
The heat capacity of the body is 60JK-1.
A refrigerator converts 100 g of water at 20°C to ice at -10°C in 35 minutes. Calculate the average rate of heat extraction in terms of watts.
Given: Specific heat capacity of ice = 2.1 J g-1°C-1
Specific heat capacity of water = 4.2 J g-1°C-1
Specific latent heat of fusion of ice = 336 J g-1
Name a liquid which has the highest specific heat capacity.
How will rise in sea level affect population in coastal countries?
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The product of mass and specific heat is known as ..........
650 J of heat is required to raise the temp. of 0.25 kg of lead from 15°C to 35°C. Calculate the Sp. heat capacity of lead.
Specific heat capacity of a substance A is 3.8 J g-1 K-1 and of substance B is 0.4 J g-1 k-1. Which substance is a good conductor of heat? How did you arrive at your conclusion?
Does the specific heat capacity of a substance depend upon its mass and rise in temperature only?
Explain, why is water sprayed on roads in evening in hot summer?
Give two reasons as to why copper is preferred over other metals for making calorimeters.
How much heat energy is necessary to raise the temperature of 5 kg of water from 20°C to 100°C?
Consider the statement given below and choose the correct option.
Assertion: Radiation is a form of heat transfer which takes place only in vacuum.
Reason: The thermal energy is transferred from one part of a substance to another part without the actual movement of the atoms or molecules.
The heat capacity of the vessel of mass 100 kg is 8000 J/°K. Find its specific heat capacity.
Heat is applied to a rigid diatomic gas at constant pressure. The ratio ΔQ : ΔU : ΔW is ______.
The specific heat capacity of ______ is maximum.
Specific heat capacity of a substance X is 1900 Jkg-1°C-1 means ______.
Give one example where high specific heat capacity of water is used as heat reservoir.
