Wave Technology Uses - Middle School Physical Science
Card 1 of 25
What is the term for sending information by changing a wave’s amplitude, frequency, or phase?
What is the term for sending information by changing a wave’s amplitude, frequency, or phase?
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Modulation. Altering wave properties encodes information for transmission.
Modulation. Altering wave properties encodes information for transmission.
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What is the term for the high-frequency wave that carries information in radio communication?
What is the term for the high-frequency wave that carries information in radio communication?
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Carrier wave. High-frequency waves transport modulated information signals.
Carrier wave. High-frequency waves transport modulated information signals.
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What does AM stand for in radio broadcasting?
What does AM stand for in radio broadcasting?
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Amplitude modulation. Broadcasting method that varies carrier wave height.
Amplitude modulation. Broadcasting method that varies carrier wave height.
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What does FM stand for in radio broadcasting?
What does FM stand for in radio broadcasting?
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Frequency modulation. Broadcasting method that varies carrier wave rate.
Frequency modulation. Broadcasting method that varies carrier wave rate.
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Which property of the carrier wave is changed in AM to encode information?
Which property of the carrier wave is changed in AM to encode information?
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Amplitude. AM varies wave height to encode the message signal.
Amplitude. AM varies wave height to encode the message signal.
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Which property of the carrier wave is changed in FM to encode information?
Which property of the carrier wave is changed in FM to encode information?
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Frequency. FM varies wave rate to encode the message signal.
Frequency. FM varies wave rate to encode the message signal.
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Which has the higher frequency: an infrared wave or a radio wave?
Which has the higher frequency: an infrared wave or a radio wave?
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Infrared wave. Infrared has higher frequency than radio on EM spectrum.
Infrared wave. Infrared has higher frequency than radio on EM spectrum.
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Which has the longer wavelength: a $100\ \text{MHz}$ signal or a $900\ \text{MHz}$ signal?
Which has the longer wavelength: a $100\ \text{MHz}$ signal or a $900\ \text{MHz}$ signal?
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$100\ \text{MHz}$. Lower frequency means longer wavelength at constant speed.
$100\ \text{MHz}$. Lower frequency means longer wavelength at constant speed.
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What is the relationship between wave speed, frequency, and wavelength?
What is the relationship between wave speed, frequency, and wavelength?
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$v = f\lambda$. Wave speed equals frequency times wavelength.
$v = f\lambda$. Wave speed equals frequency times wavelength.
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Which part of the electromagnetic spectrum is used for most radio and TV broadcasting signals?
Which part of the electromagnetic spectrum is used for most radio and TV broadcasting signals?
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Radio waves. Low-frequency electromagnetic waves ideal for broadcasting.
Radio waves. Low-frequency electromagnetic waves ideal for broadcasting.
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What is the term for using light pulses in a fiber to carry data over long distances?
What is the term for using light pulses in a fiber to carry data over long distances?
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Fiber-optic communication. Light pulses transmit data through glass fibers.
Fiber-optic communication. Light pulses transmit data through glass fibers.
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Which generally carries more data: a higher-bandwidth channel or a lower-bandwidth channel?
Which generally carries more data: a higher-bandwidth channel or a lower-bandwidth channel?
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Higher-bandwidth channel. More frequencies available means more data capacity.
Higher-bandwidth channel. More frequencies available means more data capacity.
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What is the main reason fiber-optic cables can transmit large amounts of data?
What is the main reason fiber-optic cables can transmit large amounts of data?
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High-frequency light supports high bandwidth. Light's high frequency allows more data transmission.
High-frequency light supports high bandwidth. Light's high frequency allows more data transmission.
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Which type of wave carries information through a fiber-optic cable: mechanical or electromagnetic?
Which type of wave carries information through a fiber-optic cable: mechanical or electromagnetic?
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Electromagnetic (light) waves. Light waves travel through fiber, not mechanical vibrations.
Electromagnetic (light) waves. Light waves travel through fiber, not mechanical vibrations.
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What is the term for unwanted signals that interfere with a transmitted wave-based message?
What is the term for unwanted signals that interfere with a transmitted wave-based message?
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Noise (interference). Random signals that corrupt transmitted information.
Noise (interference). Random signals that corrupt transmitted information.
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Identify the device that converts sound waves into electrical signals in a phone or headset.
Identify the device that converts sound waves into electrical signals in a phone or headset.
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Microphone. Transducer creates electrical signals from sound waves.
Microphone. Transducer creates electrical signals from sound waves.
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Identify the device that converts electrical audio signals into sound waves in a phone or speaker.
Identify the device that converts electrical audio signals into sound waves in a phone or speaker.
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Speaker. Transducer creates sound waves from electrical signals.
Speaker. Transducer creates sound waves from electrical signals.
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What is a binary digital signal in communication systems?
What is a binary digital signal in communication systems?
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Information encoded using two states, 0 and 1. Binary encoding uses on/off states for digital communication.
Information encoded using two states, 0 and 1. Binary encoding uses on/off states for digital communication.
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What is the term for removing the information from a received carrier wave?
What is the term for removing the information from a received carrier wave?
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Demodulation. This process extracts the original information from the carrier.
Demodulation. This process extracts the original information from the carrier.
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What is the main function of an antenna in a wireless system?
What is the main function of an antenna in a wireless system?
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Convert electrical signals to radio waves and back. Antennas act as transducers between electrical and electromagnetic energy.
Convert electrical signals to radio waves and back. Antennas act as transducers between electrical and electromagnetic energy.
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What is the definition of bandwidth in communication technology?
What is the definition of bandwidth in communication technology?
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The range of frequencies a signal occupies. Wider bandwidth allows more information to be transmitted.
The range of frequencies a signal occupies. Wider bandwidth allows more information to be transmitted.
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Which wave property is changed in FM to transmit information?
Which wave property is changed in FM to transmit information?
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Frequency. FM varies oscillation rate while keeping amplitude constant.
Frequency. FM varies oscillation rate while keeping amplitude constant.
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Which wave property is changed in AM to transmit information?
Which wave property is changed in AM to transmit information?
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Amplitude. AM varies wave height while keeping frequency constant.
Amplitude. AM varies wave height while keeping frequency constant.
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What does FM stand for in radio communication?
What does FM stand for in radio communication?
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Frequency modulation. FM varies the wave's rate of oscillation to encode the signal.
Frequency modulation. FM varies the wave's rate of oscillation to encode the signal.
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What does AM stand for in radio communication?
What does AM stand for in radio communication?
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Amplitude modulation. AM varies the wave's height to encode the signal.
Amplitude modulation. AM varies the wave's height to encode the signal.
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