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प्रश्न
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संबंधित प्रश्न
State two factors upon which the rate of emission of thermions depends.
What is the energy absorbed during the phase change called?
Explain the following:
The surrounding become pleasantly warm when water in a lake starts freezing in cold countries.
Explain the following:
The heat supplied to a substance during it change of state, does not cause any rise in its temperature.
The specific latent heat of fusion of water is ______.
A molten metal of mass 150 g is kept at its melting point 800℃. When it is allowed to freeze at the same temperature, it gives out 75,000 J of heat energy.
- What is the specific latent heat of the metal?
- If the specific heat capacity of metal is 200 J kg-1 K-1, how much additional heat energy will the metal give out in cooling to -50℃?
A refrigerator converts 100g of water at 20℃ to ice at – 10℃ in 73.5 min. Calculate the average rate of heat extraction in watt. The specific heat capacity of water is 4.2 J kg-1 K-1, specific latent heat of ice is 336 J g-1 and the specific heat capacity of ice is 2.1 J kg-1 K-1.
Explain the following temperature vs time graph.
Explain the following temperature vs time graph.
What is the name given to the energy absorbed during a phase change?
Explain the meaning of the term latent heat. State its S. I. unit.
What do you understand by the ‘latent heat of vaporization’ of a substance?
What observation you will record and how will you determine the specific latent heat of fusion of ice?
If there is no Heat loss to the surroundings, the heat released by the condensation of m1 g of steam at 100°C into water at 100°C can be used to convert m2 g of ice at 0°C into water at 0°C.
(i) Find:
(a) The heat lost by steam in terms of m1
(b) The heat gained by ice in terms of m2
(ii) Form a heat equation find the ratio of m2 : m1
Specific latent heat of vaporization of steam = 2268 kJ/kg
Specific latent heat of fusion of ice = 336 kJ/kg
Specific heat capacity of water = 4200 J/kg°C
When ice is converted into water : constant temperature : : before the water evaporates : _______
How fog is formed?
Match the columns.
| Column A | Column B |
| 1) Absolute humidity | a) J or cal |
| 2) Latent heat | b) J/kg °C |
| 3) Specific heat capacity | c) kJ/kg |
| 4) Heat | d) no unit |
| e) kg/m3 |
Specific latent heat L = ______.
Give some practical applications of specific latent heat of ice.
Calculate the amount of heat required to convert 200g of ice at 0°C into the water at 0°C Specific latent heat of fusion of ice = 336 Jg-1
