The Electromagnetic Spectrum

Transcription

1 The Electromagnetic Spectrum describe different types of electromagnetic radiation, including infrared, X-rays, ultraviolet, microwaves and radio waves compare properties of visible light to the properties of other types of electromagnetic radiation, including infrared, X-rays, ultraviolet, microwaves and radio waves Describe possible negative and positive effects of technologies associated with electromagnetic radiation Explain the importance of using the words frequency and wavelength correctly

2 Light is a form of radiant energy that you can see. However, the visible part that you can see is only a small part of the range of radiant energies.

3 What is radiant energy? Radiant energy is energy transferred or emitted as waves or rays in all directions.

4 What is a radiant? A radiant is energy that is sent out in the form of waves or rays.

5 Other radiant energies are microwaves, UV rays (ultraviolet radiation), infrared, radio waves and X rays. You cannot see these other radiant energies, but they are of the same kind as light. The whole range of radiant energies is called the electromagnetic spectrum.

6 What is radiation? Radiation is the heat transfer of radiant energy waves or rays such as light. wavelength corresponds to the energy of the light

7 Remember when we did Water Systems, we talked about waves? Energy can also be transmitted as a wave. Waves with short wavelengths have more energy, because more energy is needed to create them.

8 Radiation in Space Light can travel through space (obviously, that is how the sunlight reaches us) Can other parts of the magnetic spectrum travel through space as well? Yes Light and other parts of the electromagnetic spectrum can travel at very high speeds. In a vacuum, such as space, the speed is km/s. It takes light 1.3s to get from the Earth to the moon.

9 Waves, Energy and Light The parts of the electromagnetic spectrum have common properties such as high speed, and the ability to travel through a vacuum. They also have differences such as wavelength, frequency, and energy. See Figure 3 on page 298 and 299

10 Questions Page and 2

11 Presentation In groups of 2, pick a common technology that makes use of electromagnetic radiation. Follow the rubric provided below. Examples of technologies are X-ray machines, microwaves, cell phones, nuclear industry, and more. Only 1 group present a topic, so you must tell me as soon as you know your topic!

12 Rubric Technology choice The technology that was chosen does not use electromagnetic radiation The technology that was chosen is a satisfactory example of using electromagnetic radiation The technology that was chosen is a very good example of using electromagnetic radiation The technology that was chosen is an excellent example of using electromagnetic radiation Explanation of technology The technology was not explained well, had many mistakes and was less than 50 words The technology was explained, but was missing a key point and had 10 or less mistakes with at least 50 words The technology was explained adequately, with less than 5 mistakes and had at least 75 words The technology was explained well, with correct use of language (1-2 mistakes) and had more than 100 words Pictures of technology There were no pictures to show the technology There was one picture to show the technology There were two pictures to show the technology, but neither was labelled to show parts There were two pictures to show the technology and one was fully labelled showing how the parts of the technology Positive and Negative Effects There was only 1 positive or 1 negative effect of the technology given There were at least 2 positive and 2 negative effects of the technology given There were 3 positive effects and 2 negative effects given or vice versa There were 3 positive and 3 negative effects given for the technology Conclusion The conclusion did not state how the student felt about the technology (good or bad) The conclusion stated how the student felt about the technology, but did not explain why The conclusion stated how the student felt about the technology and why The conclusion stated how the student felt about the technology and why and the student showed original thought in the conclusion Oral Presentation Would not present to the class, but had the project complete Presented to the class, but did not face the audience and was hard to hear Presented to the class, but did not either face the crowd or talk loud enough to be heard Presenters faced the audience, explained the topic well and were loud enough to be heard Visual Presentation There was no visual display (PowerPoint, Bristol Board, etc.) of the Project There was a visual display (PowerPoint, Bristol Board, etc.) of the Project, but it was not readable and unorganized There was a visual display (PowerPoint, Bristol Board, etc.) of the Project and it was well organized and readable The visual display (PowerPoint, Bristol Board, etc.) went above expectations, was well organized, readable and original

13 Things to consider Your presentation should Have a title page/title Have the group members names Be neat and readable Be organized so that you explain the technology first, then have pictures with parts labelled, then list positive and negative effects, then have a conclusion slide with your opinion