LIGHT powerpoint presentation lesson plan for grade 7

LIGHT powerpoint presentation lesson plan for grade 7

1. What is light? Is a electromagnetic wave It does not need medium in order to propagate Travels in a straight path

2. ARTIFICIAL SOURCE OF LIGHT Lamp, Bulb, Candle

3. Luminous Object light sources that emit their own light

4. Illuminated Objects/Materials Do not produce their own light

5. Explore light energy 1. Make a list of all the light sources you notice 2. How they use light in their everyday life

6. (LIGHT HUNT) 1. Student will go around the room and look for up to 5 sources of light 2. Discuss whether each item uses artificial light or not

7. CHARACTERISTICS OF LIGHT (INTENSITY AND COLOR) BRIGHTNESS is qualitative and dependent to person’s perception. Quantitatively, brightness is expressed as Luminous intensity

8. BRIGTNESS

9. Luminous intensity refers to the amount of light power emanating from a point source within a solid angle of Steradian

10. Varied Sources produce different light intensity

11. James clerk Maxwell discover the electromagnetic Wave theory of light. He combined the concepts of electricity and magnetism to come up with his theory on electromagnetic waves. ELECTRICITY + MAGNITISM

12. Characteristic of light as a wave: • Wavelength • Frequency • Wave speed

13. Different form of electromagnetic waves arranged according to frequency (Lowest to highest)

14. electromagnetic waves ARE: Radio waves Microwaves Infrared Visible light Ultra violet X-ray Gammaray

15. Application of electromagnetic wave

16. dispersion Is a phenomenon in which a prism separates white light into component colors

17. Component color of visible light ( roy g bv )

18. SHORT QUIZ 1. It’s a electromagnetic wave does not need medium to propagate and it travels in a straight path a. Sun b. Light c. moon d. Particles Choose the letter of the correct answer

19. SHORT QUIZ 2. What is the main source of light? a. Sun b. moon c. Flashlight d. candle Choose the letter of the correct answer

20. SHORT QUIZ 3. This people were the first to study about light a. Isaac Newton, James Prescott Joule, Galileo Galilei, Charles Darwin b. Isaac Newton, Christopher Huygens, Louie de Broglie, James Clerk Maxwell c. Isaac Newton and Christian Huygens d. Isaac Newton, Christian Huygens, Louie de Broglie, James Clerk Maxwell Choose the letter of the correct answer

21. SHORT QUIZ 4. He combined the concepts of electricity and magnetism a. Christian Huygens, b. Louie de Broglie c. James Clerk Maxwell d. Isaac Newton Choose the letter of the correct answer

22. SHORT QUIZ 5. _______is a phenomenon in which a prism separates white light into component colors a. Dispersion b. mirror c. luminous intensity d. wave Choose the letter of the correct answer

23. Assignment: Bring the following materials on Monday • White screen (Folder or illustration board) • Button fastener • Glue or paste • Scissor

24. ACTIVITY 1 (Colors of Light – Colors of Life!) Objectives: After performing this activity, you should be able to   Make a color Spectrum Wheel; Explore the characteristics of color lights   Materials needed: White screen (Folder or illustration board) Button fastener Glue or paste Scissor  

25. ACTIVITY 1 (Colors of Light – Colors of Life!) Procedure (Part 1 Color Wheel) Cut the two art files that make up the wheel on the next pages Cut along the lines drawn on the top wheel. Cut the two sides as shown. The small window near the center of the wheel should be completely cut out and removed. Punch a hole at the center of the two wheels. You may use a button fastener to secure the two wheels together one on top of the other, but they should be free to rotate relative to each other When you see a region of the color spectrum show up in the open window and the ‘W, F, E’ that correspond to that region showing up under the flaps then you know that you done it right.

26. ACTIVITY 1 (Colors of Light – Colors of Life!) Part 2: Characteristics of Light Try out your Color Spectrum Wheel by positioning the inner most of the flaps on Color Spectrum. This will simultaneously position the other flaps to Wavelength & Frequency Turn the upper wheel and observe the combinations Fill in the table similar to table 3 with the corresponding combinations you have observed using your spectrum wheel.

27. ACTIVITY 1 (Colors of Light – Colors of Life!) Table 3: (Characteristics of color Lights) Color Spectrum Frequency Wavelength Red 422 700 Orange Yellow     Green     Blue     Violet     Answer the following questions: Q1. Which color registers the highest frequency? Shortest wavelength? Q2. Which color registers the lowest frequency? Highest wavelength?