thermal radiation lesson plan lesson 1
TRANSCRIPT
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Thermal radiation and surface radiation
Energy and Energy Resources
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Starter Activity
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Energy is ability to do work.
The unit of energy is Joule(J)
Forms of energy;
Light energy, Heat energy, Electrical energy, Sound energy, Kinetic energy, Potential energy (Gravitational or Elastic) and Chemical energy.
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By the end of the lesson pupils should know that;
objects give off thermal radiations depending on the temperature of an object.
surfaces emit and absorb radiations.
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Thermal Radiation, Conduction, Convection, Green house effect, Electromagnetic spectrum, Wave length, Gammer rays, infrared, ultraviolet rays, visible light, X-ray, radio wave,
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In pairs;Discuss how heat energies is transferred
in A, B and C in the above diagram
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In groups of three;Discuss why the body of the above animals are showing different colours .
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Every objects gives out (emits) different amounts of thermal radiation depending on their temperature and their surface .
The hotter an object, the more thermal radiation it emits (e.g Sun ).
The red part on the animals indicate that area has more heat ( the region is richly supplied with blood).
The blue parts of the animal indicate that the area is cold (has less heat)
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Turn to page 229 and read Energy from the Sun.
Using information from the page above, discuss the following in pairs;
1. How does heat energy from the sun reach us on earth?
2. What happens to most of the radiations in the Earth’s atmosphere?
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The sun emits radiation in form electromagnetic waves.
Earth’s atmosphere blocks most of the radiation, such as ultraviolet rays.
But it doesn’t block thermal radiation.
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What is green house effect?
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The Earth’s atmosphere acts like a greenhouse made of glass.
In a green house , shorter wavelengths radiation from the sun can pass through the glass.
Longer wavelength thermal radiation is trapped inside by the glass, making the greenhouse warm.
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1. What are the green house gases ?
2. And how do they cause green house effect?
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1. Carbon dioxide
2. Methane
3. Water vapour
These gases absorbs the Earth’s infrared radiation
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Look at the pictures below and in pairs;
Discussed why the thermal blanket and fire suit have shiny outer surface and the car radiator is painted black?
Fir
e M
an
Car Radiator
Th
erm
al B
lan
ket
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Dull black surface loses energy more quickly; its a good radiator and good absorber. It takes in and give out a lot of radiation. That’s why car radiators and motor bike engine are painted black in colour.
The shiny surfaces reduces radiation (and convection and evaporation). It is a poor radiator and poor absorber. That’s why the thermal blankets and fire suit have shiny outer surfaces.
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