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| 1. What are the three modes of heat transfer? |  |
Ans. The three modes of heat transfer are conduction, convection, and radiation. Conduction is the transfer of heat through direct contact between objects or substances. Convection is the transfer of heat through the movement of fluids, such as air or water. Radiation is the transfer of heat through electromagnetic waves.
| 2. How does conduction work in heat transfer? | |
Ans. Conduction is the transfer of heat between objects or substances that are in direct contact with each other. It occurs through the vibration and collision of atoms or molecules, which transfers thermal energy from the hotter object to the colder one. Materials that are good conductors, such as metals, allow heat to transfer more easily compared to insulators, such as wood or plastic.
| 3. What is convection and how does it work in heat transfer? | |
Ans. Convection is the transfer of heat through the movement of fluids, such as air or water. It occurs when heated particles in a fluid become less dense and rise, while cooler particles sink, creating a continuous circulation of the fluid. This circulation carries the heat from one location to another. Convection can occur in two forms: natural convection, which is driven by temperature differences alone, and forced convection, which involves the use of external devices, such as fans or pumps, to enhance the fluid movement.
| 4. How does radiation work in heat transfer? | |
Ans. Radiation is the transfer of heat through electromagnetic waves. Unlike conduction and convection, radiation does not require a medium to transfer heat. Heat energy is emitted in the form of electromagnetic waves, such as infrared radiation, which can travel through empty space. These waves can be absorbed or reflected by objects, and the absorbed energy is converted into heat. Radiation is responsible for the transfer of heat from the Sun to the Earth and is also commonly used in various heating systems, such as infrared heaters.
| 5. Which mode of heat transfer is most effective in a vacuum? | |
Ans. Radiation is the most effective mode of heat transfer in a vacuum. Since radiation does not require a medium to transfer heat, it can occur even in the absence of particles or molecules. This is why the Sun's heat can reach the Earth through the vacuum of space. In situations where conduction and convection are not possible, such as in outer space, radiation becomes the primary mode of heat transfer.
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