Ten100: Chapter 27 Assignment

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Questions and Answers
  • 1. 

    When Alex arrived in Alaska in 1970, why didn't people in the Alaskan bush have telecommunications services? How did rural Alaskans communicate over long distances?

  • 2. 

    How did Alex draw on his earlier work when developing Wi-Fi technology?

  • 3. 

    Why wouldn't shortwave communications problem in rural Alaska? How did satellites solve the problem?

  • 4. 

    What is the frequency of the broadcast by your favorite radio station?

  • 5. 

    Some rural Alaskan villages are not on the Alaskan power distribution grid. List a few ways that the towns might power the communications technologies they now use.

  • 6. 

    _____________ is often described as waves of energy. It is very useful for transmitting information because it travels fast.

    Explanation
    Electromagnetic waves are often described as waves of energy. These waves consist of electric and magnetic fields that oscillate in perpendicular directions. Electromagnetic waves can travel through a vacuum or a medium and they travel at the speed of light. Due to their ability to travel fast, electromagnetic waves are very useful for transmitting information, such as in the case of radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays. Therefore, both "electromagnetic" and "electromagnetic energy" can be correct answers as they accurately describe the nature and usefulness of electromagnetic waves.

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  • 7. 

    A ____________ is one complete wave, labeled as the distance from the peak of the wave to the next peak.

    Explanation
    A wavelength refers to one complete wave, specifically the distance from the peak of the wave to the next peak. It is a measurement used to describe the length or distance of a wave. In this context, "wavelength" and "wave length" are two different ways of writing the same term.

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  • 8. 

    Radio waves have the lowest _____________.

    Explanation
    Radio waves have the lowest frequency among all types of electromagnetic waves. Frequency refers to the number of wave cycles that occur in one second. Since radio waves have the lowest frequency, they have the longest wavelength and the least amount of energy. This makes them suitable for long-distance communication, as they can travel through obstacles and are less likely to be absorbed or scattered by the atmosphere.

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  • 9. 

    ____________ is the length of waves per second.

    Explanation
    Frequency is the number of waves that pass a given point in one second. It is a measure of how often a wave oscillates or repeats itself in a given time period. Therefore, frequency can be defined as the length of waves per second.

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  • 10. 

    As the frequency of a wave increases, its wavelength _____________, and vice versa.

    Explanation
    As the frequency of a wave increases, its wavelength decreases, and vice versa. This is because frequency and wavelength are inversely proportional to each other. When the frequency of a wave increases, it means that more wave cycles occur in a given time period. As a result, the distance between each wave cycle, which is the wavelength, becomes shorter. Conversely, when the frequency decreases, there are fewer wave cycles in a given time period, causing the wavelength to become longer.

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  • 11. 

    Short radio can travel long distances by bouncing off a layer of the atmosphere called the _____________.

    Explanation
    Short radio waves are able to travel long distances by bouncing off the ionosphere, a layer of the Earth's atmosphere. The ionosphere is composed of ionized particles that can reflect and refract radio waves, allowing them to travel beyond the line of sight. This phenomenon is known as ionospheric reflection. The ionosphere acts like a mirror for radio waves, enabling them to be transmitted over long distances, even across continents or oceans.

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  • 12. 

    Satellites operate on a frequency of four to six ___________.

    Explanation
    Satellites operate on a frequency of four to six gigahertz (GHz). Gigahertz is a unit of frequency commonly used to measure the speed of electronic signals. Satellites use this frequency range to transmit and receive signals for various purposes such as communication, weather monitoring, and navigation. The GHz unit represents billions of cycles per second, allowing satellites to transmit and process large amounts of data efficiently.

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  • 13. 

    In 1993, a new technology was created at Carnegie Mellon University called Wireless Andrew, which is today known as ___________.

    Explanation
    In 1993, Carnegie Mellon University created a new technology called Wireless Andrew, which eventually became known as wireless internet or wifi.

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