Question

Define radiation? Give one example to show the heat transfer by radiation?​

Answer 1

$\huge\underline\purple{Answer:-}$

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$\sf\blue{↬}$ It is the transfer of heat energy from a hot body to cold body by means of heat rays, without any material medium between them..

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Eg to show the heat transfer by radiation is:-

$\sf\green{➝}$ $\sf\pink{Heat \ from \ the \ sun \ reaches \ on \ the \ earth \ by \ process\ of \ radiation}$

It as follows:-

$\sf\orange{➳}$ The sun is an extremely hot object. The sun emits heat radiations (or heat rays) in all directions.. These heat radiation travel through a vacuum between the sun and the earth at very high speed and reaches on the earth. when the sun's radiations falls on the earth and it's object, they receive heat energy and hence get heated...

so sun's heat reaches earth by radiation...

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Additional information :-

• there are 3 different ways by which heat can be transferred..

• 1) $\sf\red{conduction}$

• 2) $\sf\green{convection}$

• 3) $\sf\blue{radiation}$

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$\sf\orange{✰}$ $\sf\purple{Conduction}$

$\sf\blue{↬}$ It is the transfer of heat from hot part of material to its colder part(without any movement of material as whole) is called $\sf\green{Conduction}$

⋆ it takes place only in solids..

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$\sf\orange{✰}$ $\sf\purple{Convection}$

$\sf\blue{↬}$ It is the transfer of heat from hotter part of liquid (or gas) to its colder parts by movement of liquid itself is called $\sf\green{convection}$

⋆ it takes place only in liquid and gases..

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$\sf\orange{✰}$ $\sf\purple{radiation}$

$\sf\blue{➝}$ Plxx see the defination above..

⋆it takes place wheather medium is present or not...

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hope you have got your answer!!!

Answer 2

Answer:

Radiation can be defined as energy from a source that travel through space or other medium.

• Heat, light, microwaves,  radio waves used for wireless communications are form of radiation.
• Radiation involves particles and electromagnetic waves carry energy which are emitted by some materials.
• The radiation can produce charged particles (or ions) in matter are called ionizing radiations. Such as X-rays, gamma-rays, alpha particles, beta particles and neutrons.
• The sun is a major source of radiation arising from space. The heat of the sun travels through radiations and reached to the earth.
• At high altitudes, airline flights and skiing are activities that will increase exposure to the cosmic radiations.
• Some medical procedures provide radiation doses such as a typical X-ray or CT scan of head expose human body to 2,600 μSv of ionizing radiation.
• Banana has high potassium content. Eating a banana will provide you with a dose of 0.1 μSv from the naturally occurring potassium-40 isotope.

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