Question

Answer the following questions in detail in at least 200 words. ( 50 * 1 = 50 MARKS)

1. Differentiate Radiation, Conduction and Convection

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Answer 1

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• 1- In conduction, heat transfer takes place between objects by direct contact.

• In convection, the heat transfer takes within the fluid. the heat transfer occurs through a heated solid object

• In radiation, heat transfer occurs through electromagnetic waves without involving the particles.
• The heat transfer takes place due to the difference in temperature. The heat transfer occurs due to the difference in density. The heat transfer occurs in all objects with a temperature greater than 0 K
• The heat transfer in conduction is slow The heat transfer in convection is faster. The heat transfer in radiation is the fastest.
• The heat transfer occurs through a heated solid object. The heat transfer occurs through intermediate objects. For example, heat transfer between air and water. The heat transfer occurs through electromagnetic waves.
• It does not follow the law of reflection and refraction. It does not follow the law of reflection and refraction. It follows the law of reflection and refraction.

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Answer 2

Radiation is the process by which energy is emitted as either particles or waves. Broadly, it can take the form of sound, heat, or light. However, most people generally use it to refer to radiation from electromagnetic waves, ranging from radio waves, though the visible light spectrum, and up through to gamma waves.

Conduction is the way in which energy is transferred (through heating by contact) from a hot body to a cooler one (or from the hot part of an object to a cooler part). It is the result of particle motion: fast or vigorously moving particles bumping into less energetic particles and making them move faster or vibrate more vigorously.

Convection is the transfer of internal energy into or out of an object by the physical movement of a surrounding fluid that transfers the internal energy along with its mass. Although the heat is initially transferred between the object and the fluid by conduction, the bulk transfer of energy comes from the motion of the fluid. Convection can arise spontaneously (or naturally or freely) through the creation of convection cells or can be forced by propelling the fluid across the object or by the object through the fluid.

$\huge\mathcal\fcolorbox{green}{lavender}{Conduction}$

1. It is the tranfer of heat by direct Physical contact.
2. It is due to temperature difference heat flows fr high temperature region to low temperature region.
3. It occurs in solids through molecular collisions, without actual flow of water.
4. It is a slow process.
5. It does not obey the laws of reflection and refraction.

$\huge\mathcal\fcolorbox{red}{pink}{Convection}$

1. It is the tranfer of heat by the motion of a fluid.
2. It is due to difference in density. Heat flows from low density region to high density region.
3. It occurs in fluids by actual flow of matter.
4. It is a slow process.
5. It does not obey the laws of reflection and refraction.

$\huge\mathcal\fcolorbox{blue}{cyan}{Radiation}$

1. It is the tranfer of heat by electromagnetic waves.
2. It occurs from all bodies at temperature above 0 k.
3. It can take place at large distances and does not heat thr intervening medium.
4. It propagates at the speed of light.
5. It obeys the laws of reflection and refraction.

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