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Electromagnetic Radiation Classwork & Homework
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Classwork #1: What is Electromagnetic Radiation
c = λf c = 300,000,000 m/s time (s) = distance (m)/ speed (m/s)
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1 What are some sources of electromagnetic radiation?
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2 What is meant by the term “medium”?
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3 Why can electromagnetic waves travel through a vacuum?
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4 What speed do all electromagnetic waves travel at in vacuum?
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5 Red light, a type of electromagnetic wave, has a wavelength of 0.0000078 meters, what is its frequency in Hz?
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6 Most kitchen microwaves operate at a frequency
- f 2,450 MHz or 2,450,000,000 Hz. What is the
wavelength of these microwaves?
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7 Alpha Centauri is the nearest star to Earth at 41,342,509,100,000,000 meters away. How long would it take a radio signal – a type of electromagnetic wave – from Alpha Centauri to reach Earth?
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8 TV channels 5 and 6 broadcast frequencies between 76 and 88 MHz. What is the wavelength
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Homework: What is Electromagnetic Radiation
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9 What do X-rays, light, microwaves, and radio waves all have in common?
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10 All electromagnetic waves travel at what speed in a vacuum?
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11 What is a vacuum?
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12 When electromagnetic waves travel through matter, what happens to their speed?
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13 Which of the following electromagnetic waves has the highest frequency: 1.0 m wavelength, 100 m wavelength, 0.001 m wavelength, or 1,0000 m wavelength?
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14 How does the frequency of an electromagnetic wave with a long wavelength compare to the frequency of an electromagnetic wave with a short wavelength?
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Classwork #2: The Electromagnetic Spectrum
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15 What does the term “spectrum” mean?
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16 What happens to the energy of a wave as the frequency of a wave increases?
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17 What happens to the energy of a wave as the wavelength of a wave increases?
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18 What form of electromagnetic wave has the highest energy?
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19 What form of electromagnetic wave has the lowest energy?
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20 Rank the following forms of electromagnetic radiation in order of increasing energy: Infrared Waves, Radio Waves, X-Rays
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21 Rank the following forms of electromagnetic radiation in order of increasing energy: Gamma Rays, Microwaves, Ultraviolet
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Homework: The Electromagnetic Spectrum
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22 In order for a radio to work, what two items are needed?
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23 What are 5 ways microwaves are used?
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24 What are the three major categories of light electromagnetic radiation?
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25 Rank the following in order from longest to shortest wavelength: red light, infrared, ultraviolet, and violet light.
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26 What does the acronym ROYGBIV stand for and what is its purpose?
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27 What are the two highest energy types of electromagnetic radiation and what are they used for?
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Classwork #3: Light Interactions with Matter
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28 What is the imaginary line perpendicular to the surface of a material called?
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29 The angle between the incoming light and the line asked for in #28 is called what?
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30 What is the angle between the reflected light and the line in #28 called?
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31 What is the relationship between the two angles in #29 and #30?
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32 What is another term for the bending of light?
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33 In order for light to refract what two conditions must be met?
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34 If light enters a denser material from one that is less dense, how will the light behave?
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35 If light enters a less dense material from one that is denser, how will the light behave?
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Homework: Light Interactions with Matter
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36 Based on the diagram below, which substance is denser? How do you know
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37 When light enters a substance with a different density, what is the angle of reflection?
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38 How does the angle of refraction for light with a higher frequency compare to that of a lower frequency light?
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39 How does the angle of refraction compare for red and violet light passing through the same object? Explain.
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40 If a light passes from air, through glass, and back into air, how does the angle of refraction from glass to air compare to the angle of incidence from air to glass?
