Science 10 - Introduction to Electromagnetic Waves
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- 2. WELCOME TO QUARTER 2: WEEK 1 Prepared by: Mrs. Anilyn A. Dizon (Science Teacher)
- 3. Objectives: At the end of the lesson, you will be able to: 1. Discuss how electromagnetic waves are formed. 2. Differentiate mechanical waves with electromagnetic waves. 3. Compare the relative frequencies of different forms of electromagnetic waves 3
- 4. a v w e 4 It is a disturbance in space. wave
- 5. S e c r t 5 It is the highest point in a wave. crest
- 6. t g h u r o 6 It is the lowest point in a wave. trough
- 7. l m u p t d e a i 7 It is the distance from the midpoint to the highest (or lowest) point of a wave. amplitude
- 8. e n e v t g w l a h 8 It is the distance between two successive identical parts of a wave. wavelength
- 9. n e q f c e u r y 9 It refers to the number of waves produced in one second. frequency
- 10. a r g n e 10 It refers to the extent or the limits between which variation is possible. range
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- 12. To know the lesson for today, let me ask you a few questions: ✘ What is your favorite color? 12 ✘ Do you use remote control on your TV? ✘ Have you felt the warmth of the sun on your skin?
- 13. To know the lesson for today, let me ask you a few questions: 13 ✘ Did you send text messages to somebody today? ✘ Or have you ever tried cooking in a microwave oven?
- 15. View a short video presentation on the Characteristics of Electromagnetic Waves 15 https://www.youtube.com/watch?v=pj_ya0e20vE&t=26s
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- 17. are waves that are created as a result of vibrations between an electric field and a magnetic field What are Electromagnetic Waves? 17
- 18. 18 These waves are a combination of electric and magnetic fields. A changing magnetic field produces an electric field and a changing electric field produces a magnetic field.
- 19. 19 Both the electric field and the magnetic field oscillate perpendicular to each other and to the direction of the propagating wave.
- 20. Properties of EM waves 1. All EM waves are transversewave 20
- 21. . 21 Properties of EM waves They all travel at the speed of light in vacuum c = 300, 000,000 m/s or 3 x 108 m/s They can all be emitted and absorbed by matter
- 22. 22 Ø number of cycles a wave completes in one second; expressed in Hertz FREQUENCY WAVELENGTH Ø the distance measured from one crest of a wave to the next crest
- 23. 23 Activity 1
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- 25. 25 Q1. Which electromagnetic wave has the longest wavelength? Q2. Which electromagnetic wave has the shortest wavelength? Q3. Observe what happens to the wavelength of the electromagnetic waves as they progress (goes rightward from the figure). Does the wavelength of the EM waves increase or decrease as we go from radio wave to gamma ray?
- 26. 26 Directions: Read each item carefully. Write only the letter of your choice. 1. This type of wave was discovered by famous astronomer Sir Frederick William Herschel and has a range of 7x10-7 m – 1x10-5 m. a. infrared b. microwave c. radio wave d. visible light 2. Which of the following electromagnetic waves has the least wavelength range? a. infrared (7x10-7 m – 1x10-3 m) b. x-ray (1 x10-11 m – 1 x10-8 m) c. visible light (6.22 x10-7 m – 4.55 x10-7 m) d. ultraviolet (1x10-8 m – 4x10-7 m) 3. Which among the following EM waves has the longest wavelength? a. infrared b. ultraviolet c. visible light d. x-ray
- 27. 27 4. Which electromagnetic wave can travel the farthest distances because it has a wavelength range of greater than 1x10-1 m? a. gamma ray b. microwave c. radio wave d. x-ray 5. The wavelength of microwaves ranges from 1x10-1 m to 1x10-3 m. Which of the following has size comparable to the wavelength of microwave? a. Bacteria b. Coin c. Human d. Pin
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- 32. 32 ASSIGNMENT: Make a concept web of the contributions of the following scientists. Include pictures of the scientist. (short bondpaper) A. Ampere B. Faraday C. Hertz D. Maxwell E. Oersted
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Editor's Notes
- #24: Wavelength is the distance between crest to crest or trough to trough. EM waves are bounded at different ranges. Meaning each type of EM waves has upper and lower limits on the spectrum. Using Figure 1, determine the wavelength ranges of each of the forms of electromagnetic waves. On a separate sheet of paper, copy and answer the given table on page 13. Afterwards answer the questions that follow.
- #30: Next up, let us compare the frequencies of different EM waves. Copy and answer the table on page 16, refer to Figure 2, then answer the questions that follow. Use a separate sheet of paper for your answer.