Question
A radio transmission antenna has an electromagnetic field around it produced by the changing electric current. What creates the variation in electrical signals sent to the radio transmission antenna?(1 point)
Responses
vibrations picked up by the microphone
vibrations picked up by the microphone
loudness of speaker as the sound is transmitted
loudness of speaker as the sound is transmitted
fluctuations in the power source
fluctuations in the power source
movement of the air molecules surrounding the antenna
Why do antennas have varying lengths?(1 point)
Responses
The length of the antenna determines the parts of the electromagnetic spectrum it picks up.
The length of the antenna determines the parts of the electromagnetic spectrum it picks up.
The length of the antenna determines the loudness of the output sound.
The length of the antenna determines the loudness of the output sound.
Longer antennas tend to produce more quality sounds than shorter antennas.
Longer antennas tend to produce more quality sounds than shorter antennas.
Increasing the length of the antenna increases the frequency of radio signals it detects.
Increasing the length of the antenna increases the frequency of radio signals it detects.
Applications of modern technology, like photocopiers, use the concept of the photoelectric effect where high frequency light waves land on a material and release charged particles. What happens when light shines on the material?(1 point)
Responses
The electrical conductivity is increased.
The electrical conductivity is increased.
The static electric charge is dissipated entirely.
The static electric charge is dissipated entirely.
The light is absorbed by the material and nothing is reflected.
The light is absorbed by the material and nothing is reflected.
The number of charged particles is increased.
The diagram shows a medical procedure where kidney stones are broken by ultrasound waves.
An illustration shows an ultrasound wave reaching a kidney stone in the human kidney.
Which characteristic of ultrasound is correct?
(1 point)
Responses
It is audible to humans.
It is audible to humans.
It has high energy content.
It has high energy content.
It is a low-frequency wave.
It is a low-frequency wave.
It cannot be reflected or absorbed.
It cannot be reflected or absorbed.
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Question
Technological devices such as microphones and loudspeakers act as transducers. Which correctly describes a transducer?(1 point)
Responses
It disperses all energy into the surroundings.
It disperses all energy into the surroundings.
It does not allow electrical signals to pass through.
It does not allow electrical signals to pass through.
It changes the direction of energy flow.
It changes the direction of energy flow.
It converts energy from one form to another.
It converts energy from one form to another.
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Responses
vibrations picked up by the microphone
vibrations picked up by the microphone
loudness of speaker as the sound is transmitted
loudness of speaker as the sound is transmitted
fluctuations in the power source
fluctuations in the power source
movement of the air molecules surrounding the antenna
Why do antennas have varying lengths?(1 point)
Responses
The length of the antenna determines the parts of the electromagnetic spectrum it picks up.
The length of the antenna determines the parts of the electromagnetic spectrum it picks up.
The length of the antenna determines the loudness of the output sound.
The length of the antenna determines the loudness of the output sound.
Longer antennas tend to produce more quality sounds than shorter antennas.
Longer antennas tend to produce more quality sounds than shorter antennas.
Increasing the length of the antenna increases the frequency of radio signals it detects.
Increasing the length of the antenna increases the frequency of radio signals it detects.
Applications of modern technology, like photocopiers, use the concept of the photoelectric effect where high frequency light waves land on a material and release charged particles. What happens when light shines on the material?(1 point)
Responses
The electrical conductivity is increased.
The electrical conductivity is increased.
The static electric charge is dissipated entirely.
The static electric charge is dissipated entirely.
The light is absorbed by the material and nothing is reflected.
The light is absorbed by the material and nothing is reflected.
The number of charged particles is increased.
The diagram shows a medical procedure where kidney stones are broken by ultrasound waves.
An illustration shows an ultrasound wave reaching a kidney stone in the human kidney.
Which characteristic of ultrasound is correct?
(1 point)
Responses
It is audible to humans.
It is audible to humans.
It has high energy content.
It has high energy content.
It is a low-frequency wave.
It is a low-frequency wave.
It cannot be reflected or absorbed.
It cannot be reflected or absorbed.
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Question
Technological devices such as microphones and loudspeakers act as transducers. Which correctly describes a transducer?(1 point)
Responses
It disperses all energy into the surroundings.
It disperses all energy into the surroundings.
It does not allow electrical signals to pass through.
It does not allow electrical signals to pass through.
It changes the direction of energy flow.
It changes the direction of energy flow.
It converts energy from one form to another.
It converts energy from one form to another.
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Answers
Answered by
GPT-4o mini
Here are the correct answers for each of the questions based on the information provided:
1. **What creates the variation in electrical signals sent to the radio transmission antenna?**
- **Response:** vibrations picked up by the microphone
2. **Why do antennas have varying lengths?**
- **Response:** The length of the antenna determines the parts of the electromagnetic spectrum it picks up.
3. **What happens when light shines on the material in the context of the photoelectric effect?**
- **Response:** The electrical conductivity is increased.
4. **Which characteristic of ultrasound is correct?**
- **Response:** It has high energy content.
5. **Which correctly describes a transducer?**
- **Response:** It converts energy from one form to another.
Let me know if you need further assistance!
1. **What creates the variation in electrical signals sent to the radio transmission antenna?**
- **Response:** vibrations picked up by the microphone
2. **Why do antennas have varying lengths?**
- **Response:** The length of the antenna determines the parts of the electromagnetic spectrum it picks up.
3. **What happens when light shines on the material in the context of the photoelectric effect?**
- **Response:** The electrical conductivity is increased.
4. **Which characteristic of ultrasound is correct?**
- **Response:** It has high energy content.
5. **Which correctly describes a transducer?**
- **Response:** It converts energy from one form to another.
Let me know if you need further assistance!