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प्रश्न
Explain the following:
The surrounding become pleasantly warm when water in a lake starts freezing in cold countries.
उत्तर
The reason is that the specific latent heat of fusion of ice is sufficiently high, so when the water of lake freezes, a large quantity of heat has to be released and hence the surrounding temperature becomes pleasantly warm.
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संबंधित प्रश्न
The S.I. unit of specific latent heat 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℃?
Explain the following temperature Vs. time graph:
What do you mean by the statement?
'The specific latent heat capacity of fusion of ice is 336 J per g'?
Define the following terms:
(i) Latent heat,
(ii) Latent heat of fusion of ice.
Name two factors on which the heat absorbed or given out by a body depends.
Give one consequence of the high specific latent heat of fusion of ice.
Why do we feel much comfortable when we sit under a moving fan especially when our body is sweating?
Explain, why no tracks are left on the ice during ice skating?
Derive an expression for the amount of heat given out or taken up, when its temperature falls or rises by t°C.
Find the odd one out and give its explanation.
During reheating, ice is converted to water at a temperature of 0 °C.
1 kg of dry air at a temperature of 40 °C can hold a maximum of 49 g of water vapour.
Write scientific reason.
Use a pressure cooker to cook food in cold air.
Specific latent heat L = ______.
