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Change Of State and Latent Heat Video Lecture | Physics for JEE Main & Advanced

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FAQs on Change Of State and Latent Heat Video Lecture - Physics for JEE Main & Advanced

1. What is a change of state in the context of thermodynamics?
Ans. A change of state refers to the conversion of a substance from one physical state to another, such as from solid to liquid, liquid to gas, or vice versa. It occurs when there is a gain or loss of heat energy, causing the particles of the substance to rearrange their positions and alter their kinetic energy.
2. What is latent heat and how does it relate to a change of state?
Ans. Latent heat is the amount of heat energy required or released during a change of state without any change in temperature. It is responsible for the phase transition without a change in kinetic energy. Latent heat can be either latent heat of fusion (for solid to liquid transition) or latent heat of vaporization (for liquid to gas transition).
3. How is latent heat calculated?
Ans. The latent heat can be calculated using the equation Q = mL, where Q represents the latent heat, m is the mass of the substance, and L is the specific latent heat. The specific latent heat is a constant value specific to each substance and represents the amount of heat energy required to change the state of one unit mass of the substance.
4. What are some examples of changes of state and their corresponding latent heats?
Ans. Examples of changes of state and their corresponding latent heats include: - The latent heat of fusion of ice is 334 J/g, which means it takes 334 Joules of heat energy to convert one gram of ice at 0°C to one gram of water at 0°C. - The latent heat of vaporization of water is 2260 J/g, which means it takes 2260 Joules of heat energy to convert one gram of water at 100°C to one gram of steam at 100°C.
5. How does understanding changes of state and latent heat help in everyday life?
Ans. Understanding changes of state and latent heat is important in various everyday scenarios. For example: - It helps in understanding the process of boiling water and how heat energy is needed to convert liquid water to water vapor. - It helps in understanding the functioning of refrigerators and air conditioners, where heat energy is absorbed from the surroundings to change the state of a refrigerant, resulting in cooling. - It helps in understanding the melting and freezing processes, which are essential in cooking, freezing food, and manufacturing processes.
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