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.
Question
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.
Solution
The correct answer is B. The cup and string phone transfers information using sound waves, but a cell phone transfers information using electromagnetic waves.
Here's why:
- In a cup and string telephone, when one person speaks into the cup, their voice (which is a sound wave) vibrates the bottom of the cup.
- These vibrations are transferred along the string by means of longitudinal waves (a type of mechanical wave where the wave particles move in the same direction as the wave).
- The cup at the other end of the string then converts these vibrations back into sound waves, which the other person can hear.
On the other hand, cell phones use electromagnetic waves to transfer information.
- When you speak into a cell phone, your voice is converted into an electrical signal.
- This electrical signal is then converted into electromagnetic waves, which are transmitted through the air to a nearby cell tower.
- The cell tower then sends these electromagnetic waves to the other person's cell phone, where they are converted back into an electrical signal and then into sound waves that the other person can hear.
So, while both cup and string telephones and cell phones use waves to transfer information, the type of wave and the medium through which it travels are different.
Similar Questions
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.
After using the telephone you have built, fill in the blanks to describe how sound travels from the speaker's mouth to the listener's ear. are transferred form the speaker’s mouthto the inside his/her cupthen to the then to the in the string then to the cup of the then to the air inside the cupand finally to the of the listener.
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