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State two factors upon which the rate of emission of thermions depends.
State the effect of an increase of impurities on the melting point of ice.
What do you understand by the term latent heat?
Explain the following:
The heat supplied to a substance during it change of state, does not cause any rise in its temperature.
During transformation of liquid phase to solid phase, the latent heat is ______.
When a liquid is getting converted into solid, the latent heat is ………………………………
Explain the following temperature vs time graph.
What is the name given to the energy absorbed during a phase change?
What do you understand by the ‘latent heat of vaporization’ of a substance?
Calculate the total amount of heat required to convert 100g ice at 0°C to steam at 100°C.
(Specific latent heat of fusion of ice = 336 J/g, specific latent heat of vaporization of steam = 2260 J/g, specific heat capacity of water = 4.2 J/g°C).
Steam at 100°C is passed over 1000 g of ice at 0°C. After some time, 600 g of ice at 0°C is left and 450 g of water at 0°C is formed. Calculate the specific latent heat of vaporization of steam (Given: specific heat capacity of water = 4200 J/kg°C, specific latent heat of fusion of ice = 336,000 J/kg.)
Specific latent heat of vaporisation : J/kg : : specific heat : _______
Define boiling point of a liquid.
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 |
Write scientific reason.
Use a pressure cooker to cook food in cold air.
For the same mass of ice and ice-cold water, why does ice produce more cooling than ice-cold water?
Who introduced the term latent heat?
The diagram below shows a cooling curve for a substance:
- State the temperatures at which the substance condenses.
- The temperature range in which the substance is in liquid state.
- Why do we prefer ice to ice-cold water for cooling a drink?
