Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. Which of the following best describes how such a telephone is able to transmit and receive information? A. The cellular telephone transmits, receives, and encodes information using only sound waves. B. The cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves. C. The cellular telephone transmits, receives, and encodes information using only electromagnetic waves. D. The cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound.
Question
Sally turns on her cellular telephone to speak to her friend who is located thousands of miles away. Which of the following best describes how such a telephone is able to transmit and receive information? A. The cellular telephone transmits, receives, and encodes information using only sound waves. B. The cellular telephone transmits information by sound waves to a receiver which then encodes them and produces electromagnetic waves. C. The cellular telephone transmits, receives, and encodes information using only electromagnetic waves. D. The cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound.
Solution
The correct answer is D. The cellular telephone transmits information by electromagnetic waves to a receiver which then encodes them and produces sound. Here's how it works:
- When Sally speaks into her phone, her voice is converted into an electrical signal.
- This electrical signal is then converted into electromagnetic waves by the phone's transmitter.
- These electromagnetic waves are sent through the air to a nearby cell tower.
- The cell tower sends the signal to a switching center, which sends it to the cell tower nearest to Sally's friend.
- The cell tower sends the electromagnetic waves to Sally's friend's phone.
- Sally's friend's phone receives the electromagnetic waves and converts them back into an electrical signal.
- This electrical signal is then converted back into sound by the phone's speaker, allowing Sally's friend to hear what Sally said.
Similar Questions
The image below shows two students communicating with a telephone made from cups and string.How does the information transfer between two people using a cup and string phone compare to the information transfer between two people using cell phones? A. The cup and string phone transfers information using electromagnetic waves, but a cell phone transfers information using sound waves. B. The cup and string phone transfers information using sound waves, but a cell phone transfers information using electromagnetic waves. C. Both the cup and string phone and a cell phone transfer information using sound waves, but they each travel through different mediums. D. Both the cup and string phone and a cell phone transfer information using electromagnetic waves, but they each travel through different mediums.
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