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Frequency, Hertz, and Signal Codification Quiz

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Frequency, Hertz, and Signal Codification Quiz

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Questions and Answers

What unit is used to measure the frequency of a wave?

Hertz (correct)

Joule

Watt

Volt

Which frequency band is a common WiFi band used for communication?

4 GHz

3 GHz

5 GHz (correct)

7 GHz

What does amplitude modulation (AM) mainly modulate when transmitting a signal?

Speed

Phase

Frequency

Amplitude (correct)

In information theory, what does a signal represent?

A message sequence (D) Signup and view all the answers

What is the process of varying the carrier wave frequency in accordance with the modulating signal called?

Frequency modulation (A) Signup and view all the answers

What does demodulation involve in a communication system?

Decoding information (B) Signup and view all the answers

Why was frequency modulation (FM) originally introduced?

To reduce noise and improve radio reception quality (A) Signup and view all the answers

Who developed FM (frequency modulation) radio?

Edwin Howard Armstrong (A) Signup and view all the answers

Which individual is known for discovering amplitude modulation (AM) radio?

Reginald Fessenden (D) Signup and view all the answers

What is the main advantage of frequency modulation (FM) over amplitude modulation (AM)?

Less vulnerability to noise (B) Signup and view all the answers

In communication systems, what does a channel refer to?

The medium through which messages are transmitted (C) Signup and view all the answers

How is the capacity of a communication channel often measured?

By its bandwidth in Hz or data rate in bits per second (B) Signup and view all the answers