Thermal  Radiation Lesson Plan  Lesson 1
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Thermal Radiation Lesson Plan Lesson 1



Lesson 1 Enery year 10 Physics

Lesson 1 Enery year 10 Physics



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Thermal  Radiation Lesson Plan  Lesson 1 Thermal Radiation Lesson Plan Lesson 1 Presentation Transcript

  • Energy and Energy Resources
    To day we are going to learn about ;
    Thermal radiation and surface radiation
  • Starter Activity
    What is Energy?Identify the forms of energy from the photographs.
  • What is another name for heat energy?
  • Energy and Forms of Energy
    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.
  • Lesson Objectives
    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.
  • The Key Words
    Thermal Radiation, Conduction, Convection, Green house effect, Electromagnetic spectrum, Wave length, Gammer rays, infrared, ultraviolet rays, visible light, X-ray, radio wave,
  • Activity 2
    In pairs;
    Discuss how heat energies is transferred in A, B and C in the above diagram
  • Activity 3
    In groups of three;
    Discuss why the body of the above animals are showing different colours .
  • Thermal Radiation
    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)
  • Activity 4(4 minutes Task)
    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?
  • Heat Energy from the Sun
    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.
  • Green House Effect
    What is green house effect?
  • The warming of the Earth by its atmosphere is called the greenhouse effect.Without its atmosphere, the Earth temperature would be -18 degree Celsius.
  • Green house effect.
    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.
  • Activity 5Question and Answer
    1. What are the green house gases ?
    2. And how do they cause green house effect?
  • Examples of Greenhouse gases
    1. Carbon dioxide
    2. Methane
    3. Water vapour
    These gases absorbs the Earth’s infrared radiation
  • Surfaces and Radiation
    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?
    Thermal Blanket
    Fire Man
    Car Radiator
  • Surfaces and Radiation
    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.
  • Plenary