Question

The earth receives heat from the sun by conduction true Or false​

Answer 1

Answer:

False

It receives heat through radiation

Answer 2

Earth receives heat from sun through radiation. So, the statement is false.

Explanation:

• Heat is an energy which is neither created nor destroyed. Heat is transferred from an object or material of higher temperature to an object or material of lower temperature.

Earth receives heat from sun by Radiation. Here, electromagnetic waves are involved and these rays do not need any medium to travel. Radiation need no medium of molecules to transfer heat.

Modes of heat transfer include:

Conduction:

• Conduction is the heat transfer among solid materials.
• Heat is transferred by vibration of particles of higher energy and transmitting it to lower energy particles.
• It requires molecules or particles to be close together and so liquids and gases are poor conductors of heat because the particles are farther away. Example: in stove burner.
• So, IT REQUIRES MEDIUM.

Convection:

• Convection is the heat transfer from the surface by means of fluid.
• Fluids undergo macroscopic movement for this mode of heat transfer.
• Natural convection can be explained as air is heated, it expands then rises and then is replaced by cool air. Example: in weather systems.
• IT ALSO REQUIRES MEDIUM.

Radiation:

• Radiation is the heat through empty space.
• Radiation occurs when electromagnetic wave is emitted or absorbed.
• Electromagnetic waves need to medium to travel.
• Does not require medium to travel.
• Example: sun's warmth on earth.