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प्रश्न
What is meant by specific heat capacity?
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उत्तर
Specific heat capacity of a body can be defined as the amount of heat energy required to raise the temperature of the unit mass of that body by 1°C (or 1 K).
It is given as:
s = `(Delta Q)/(DeltaT xx m)`
where,
ΔQ = Amount of heat energy supplied
ΔT = Rise in temperature
m = Mass of the body
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संबंधित प्रश्न
The temperature of 170 g of water at 50°C is lowered to 5°C by adding a certain amount of ice to it. Find the mass of ice added.
Given: Specific heat capacity of water = 4200 J kg-1 °C-1 and specific latent heat of ice = 336000 J kg-1.
45 g of water at 50°C in a beaker is cooled when 50 g of copper at 18° C is added to it. The contents are stirred till a final constant temperature is reached. Calculate this final temperature. The specific heat capacity of copper is 0.39 J g-1K-1 and that of water is 4.2 J g-1K-1. State the assumption used.
It is generally cold after a hail-storm then during and before the hail storm. Give reason.
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The ratio of specific heat capacity to molar heat capacity of a body _____________ .
(i) State whether the specific heat capacity of a substance remains the same when its state changes from solid to liquid.
(ii) Give one example to support your answer.
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.
Explain, why temperature in hot summer, falls sharply after a sharp shower?
1 kg of water freezes to form ice at 0°C. What amount of heat is withdrawn?
Water falls from a height of 50 m. Calculate the rise in the temperature of water when it strikes the bottom.
(g = 10 ms-2; Specific heat capacity of water = 4200 J / kg°C)
Calculate the ratio of two specific heats of polyatomic gas molecules.
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The diagram below shows a cooling curve for 200 g of water. The heat is extracted at the rate of 100 Js-1. Answer the questions that follow:
- Calculate specific heat capacity of water.
- Heat released in the region BC.
Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then
If the mass ratio of metal A and metal B is 3:5 then calculate the ratio in which their temperatures rise.
Match the following
| 1. | Specific heat capacity | a. | Dewar bottle |
| 2. | Calorimeter | b. | Lavoisier and Simon |
| 3. | Vacuum flask | c. | J Kg-1 K-1 |
| 4. | Ice – calorimeter | d. | Heat capacity |
Give one example where high specific heat capacity of water is used as heat reservoir.
