thermal radiation lesson plan lesson 1
DESCRIPTION
Lesson 1 Enery year 10 PhysicsTRANSCRIPT
![Page 1: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/1.jpg)
TO DAY WE ARE GOING TO LEARN
ABOUT ;
Thermal radiation and surface
radiation
Energy and Energy Resources
![Page 2: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/2.jpg)
What is Energy?
Identify the forms of energy from the photographs.
Starter Activity
![Page 3: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/3.jpg)
What is another name for heat energy?
![Page 4: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/4.jpg)
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.
![Page 5: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/5.jpg)
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.
![Page 6: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/6.jpg)
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,
![Page 7: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/7.jpg)
Activity 2
In pairs; Discuss how heat energies is transferred in A, B and C in the
above diagram
![Page 8: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/8.jpg)
Activity 3
In groups of three; Discuss why the body of the above animals are showing different colours
.
![Page 9: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/9.jpg)
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)
![Page 10: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/10.jpg)
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?
![Page 11: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/11.jpg)
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.
![Page 12: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/12.jpg)
Green House Effect
What is green house effect?
![Page 13: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/13.jpg)
The warming of the Earth by its
atmosphere is called the greenhouse effect.
Without its atmosphere, the Earth temperature would be
-18 degree Celsius.
![Page 14: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/14.jpg)
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.
![Page 15: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/15.jpg)
Activity 5
Question and Answer
1. What are the green house gases ?
2. And how do they cause green house effect?
![Page 16: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/16.jpg)
Examples of Greenhouse gases
1. Carbon dioxide2. Methane3. Water vapour
These gases absorbs the Earth’s infrared radiation
![Page 17: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/17.jpg)
Surfaces and RadiationLook 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?
Fire
Man
Car Radiator
Th
erm
al
Bla
nke
t
![Page 18: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/18.jpg)
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.
![Page 19: Thermal Radiation Lesson Plan Lesson 1](https://reader033.vdocuments.us/reader033/viewer/2022061218/54b62f1a4a795930308b4587/html5/thumbnails/19.jpg)
Plenary