Class 7 Exam > Class 7 Videos > Science Class 7 > Heat Transfer through Radiation
Heat Transfer through Radiation Video Lecture | Science Class 7
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FAQs on Heat Transfer through Radiation Video Lecture - Science Class 7
| 1. What is heat transfer through radiation? |  |
Ans. Heat transfer through radiation is the process by which heat is transferred from one object to another without the need for direct contact or a medium. It occurs through electromagnetic waves, such as infrared radiation, which can travel through empty space.
| 2. How does heat transfer through radiation work? | |
Ans. Heat transfer through radiation works by the emission and absorption of electromagnetic waves. When an object is heated, it emits thermal radiation in the form of electromagnetic waves. These waves can then be absorbed by another object, causing it to heat up. This process can occur even in the absence of a medium.
| 3. What are some examples of heat transfer through radiation? | |
Ans. Some examples of heat transfer through radiation include the warmth felt from the sun's rays, the heat emitted by a fire, or the heat received from a hot stove burner. In all these cases, the heat is transferred through radiation without the need for direct contact.
| 4. How does heat transfer through radiation differ from conduction and convection? | |
Ans. Heat transfer through radiation differs from conduction and convection in several ways. Conduction involves the transfer of heat through direct contact between objects or particles, while convection involves the transfer of heat through the movement of fluids. Radiation, on the other hand, does not require direct contact or a medium to transfer heat.
| 5. What are the factors that affect heat transfer through radiation? | |
Ans. Several factors can affect heat transfer through radiation. These include the temperature and surface area of the objects involved, the distance between them, the type of material they are made of, and the presence of any reflective or absorbing surfaces. These factors influence the rate at which heat is emitted, absorbed, and transferred through radiation.
Text Transcript from Video
he could be transferred from place to
place by conduction convection and
radiation today though we'll be focusing
our radiation all objects emit and
absorb infrared radiation even we do
just a very low amount but it can still
be picked up by thermal imaging cameras
that detect the infrared radiation and
convert it to visible light
the hotter an object is the more
radiation it emits some of it even
becomes visible light that we can see
infrared radiation is a type of
electromagnetic radiation which has a
lower frequency than light and involves
waves rather than particles this means
that unlike conduction and convection
radiation can even pass through the
vacuum of space this is why we can still
feel the heat from the Sun even though
it's 150 million kilometres away from
the air some surfaces are better than
others emitting and absorbing infrared
radiation dark matte surfaces are good
at emitting and absorb infrared
radiation which is why solar panels are
black in order to absorb the maximum
amount of heat for your hot shower white
light shiny surfaces are poor at
absorbing and emitting infrared
radiation but they are good reflectors
which is how a thermos works if you want
to keep your cup of tea hot all day you
put it in a thermos that is coated
inside with a shiny surface to reflect
the radiation back to the tea and keep
it warm for hours
you
place by conduction convection and
radiation today though we'll be focusing
our radiation all objects emit and
absorb infrared radiation even we do
just a very low amount but it can still
be picked up by thermal imaging cameras
that detect the infrared radiation and
convert it to visible light
the hotter an object is the more
radiation it emits some of it even
becomes visible light that we can see
infrared radiation is a type of
electromagnetic radiation which has a
lower frequency than light and involves
waves rather than particles this means
that unlike conduction and convection
radiation can even pass through the
vacuum of space this is why we can still
feel the heat from the Sun even though
it's 150 million kilometres away from
the air some surfaces are better than
others emitting and absorbing infrared
radiation dark matte surfaces are good
at emitting and absorb infrared
radiation which is why solar panels are
black in order to absorb the maximum
amount of heat for your hot shower white
light shiny surfaces are poor at
absorbing and emitting infrared
radiation but they are good reflectors
which is how a thermos works if you want
to keep your cup of tea hot all day you
put it in a thermos that is coated
inside with a shiny surface to reflect
the radiation back to the tea and keep
it warm for hours
you
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Nov 22, 2024 Last updated |
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