EM wave theory.pptx

EM wave

1. Science Quarter 2 (physics)

2. Question: 1. How can you describe the different picture shown on the presentation? 2. What do you think will be our topic for this day?

3. ELECTROMAGNETIC WAVE THEORY

4. OBJECTIVES: 1. Describe how electromagnetic (EM) wave is produced and propagated. 2. Trace the Timeline of EM wave theory

5. ELECTROMAGNETIC WAVE THEORY

6. Question: 1. What have you observed on the video presented?

7. ACTIVITY NO. 1 You have learned about waves during your Science 7 class. Let’s recall some important terms about waves. Below are descriptions of different terms relating to waves and the jumbled letters which will form the correct term. Your task is to rearrange the jumbled letters to form the term being described below.

8. ACTIVITY NO. 2 Match up the different contributions of the following scientist in the field of discovery of EM waves.

9. __ 1. Andrei Marie Ampere   A . Contributed in developing equations that showed the relationship of electricity and magnetism __2. Michael Faraday B . Showed experimental evidence of electromagnetic waves and their link to light __3. Heinrich Hertz C . Demonstrated the magnetic effect based on the direction of current __4. James Clerk Maxwell D . Formulated the principle behind electromagnetic induction. __5. Hans Christian Oersted E . Showed how a current carrying wire behaves like a magnet

10. C 1. Andrei Marie Ampere   A . Contributed in developing equations that showed the relationship of electricity and magnetism D 2. Michael Faraday B . Showed experimental evidence of electromagnetic waves and their link to light B 3. Heinrich Hertz C . Demonstrated the magnetic effect based on the direction of current A 4. James Clerk Maxwell D . Formulated the principle behind electromagnetic induction. E 5. Hans Christian Oersted E . Showed how a current carrying wire behaves like a magnet

11. What is Electromagnetic (EM) Wave? Electromagnetic wave (EM wave) or electromagnetic radiation is a wave that is created as a result of vibrations between an electric field and magnetic field, hence known as “electromagnetic wave”.

12. Based on Oersted’s discovery: A changing electric field produces magnetic field. A changing magnetic field is therefore produced around a vibrating charge. And according to Michael Faraday, the changing magnetic field will produce electric field.

13. A wave carries energy as it propagates, EM wave does the same, too. EM waves can travel through anything even on vacuum, meaning they do not need any medium to travel. They travel in a vacuum at a speed of 3.0 x 10 8 m/s.

14. A wave carries energy as it propagates, EM wave does the same, too. EM waves can travel through anything even on vacuum, meaning they do not need any medium to travel. They travel in a vacuum at a speed of 3.0 x 10 8 m/s which is denoted by c , the speed of light.

15. The wave speed, frequency, and wavelength are related by the following equation: v= λf Where v is the wave speed , or c (speed of light) expressed in meters per second (m/s), the frequency (f) is expressed in Hertz and the wavelength (λ) is expressed in meters .

16. what is eLECTROMAGNETIC WAVE THEORY?

17. Electromagnetic wave theory was given by James Clerk Maxwell . The main points of electromagnetic wave theory were : “ When an electrically charged particle moves under acceleration, alternating electrical and magnetic fields are produced and transmitted. These fields are transmitted in the form of waves ”

18. The Electric and Magnetic Fields Together Accelerating electrons produce electromagnetic waves. These waves are a combination of electric and magnetic fields . As accelerated electrons produce an electric field of a wave, the varying electric field produces the wave’s magnetic field. Both the electric field and the magnetic field oscillate perpendicular to each other and to the direction of the propagating wave.

19. Since electromagnetic waves are types of waves created as a result of vibrations between an electric field and magnetic field, they can be found in the following machineries/technologies such as: a. Radio, Cellphone and Television b. Satellites c. Cooking appliances such as Microwave oven d. Infrared cameras e. Fiber Optics f. Energy Efficient lamp and Tanning lamp g. Medical Imaging and treatment machines

20. Based on our discussion: 1. What is an EM wave? 2. How about EM wave theory? 3. How does EM wave was produced? 4. How does the discovery EM Waves help the life of the people today?

21. Direction: Read each statement carefully and write only the letter of the correct answer. QUIZ

22. 1. He is the Scientist who contributed in developing equations that showed the relationship of electricity and magnetism and created the EM Wave Theory ? A. James Clerk Maxwell B. Hans Christian Oersted C. Heinrich Hertz D. Michael Faraday

23. 2. Which of the following is NOT an application of EM waves? A. Radio and Television B. Satellites C. Fiber Optics D. Electric Fan

24. 3. What do you call the waves that is created as a result of vibrations between electric field and magnetic field? A. Sound wave B. EM wave C. Water Wave D. Light Wave

25. 4. The disturbance in space is known as ____? A. Wave B. Electricity C. Frequency D. Wavelength

26. 5. What is the speed of EM wave as it travel in a vacuum? A. 1.0 x 10 8 m/s B. 2.0 x 10 8 m/s C. 3.0 x 10 8 m/s D. 4.0 x 10 8 m/s