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Chapter 17: Problem 6

Suppose your radio is set to listen to \(103.7 \mathrm{FM}\). What is meant by the number \(103.7 ?\)

Short Answer

Expert verified
103.7 means the radio station broadcasts at 103.7 MHz.

Step by step solution

01

- Understanding Frequency

Radio stations broadcast at specific frequencies. The number 103.7 represents the frequency at which the radio station broadcasts its signal.
02

- Units of Frequency

Frequencies for FM radio stations are measured in megahertz (MHz). 1 megahertz is equal to 1 million hertz (Hz).
03

- Applying to the Problem

Here, 103.7 FM means the radio station broadcasts at a frequency of 103.7 MHz.
04

- Conclusion

When your radio is set to 103.7 FM, it is tuned to receive signals transmitted at the frequency of 103.7 megahertz (MHz).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

FM Radio
FM radio stands for Frequency Modulation radio. Radios use FM to broadcast high-fidelity audio signals. Unlike AM (Amplitude Modulation) radio, FM radio is less susceptible to electrical interference and static noises.
In FM radio, the audio signal's frequency is varied slightly to correspond to the sound information. This allows FM radio to deliver clearer sound.
FM radio stations broadcast within the VHF (very high frequency) radio waves, ranging between 88 to 108 MHz. When tuning in, you select a specific frequency from this range.
Megahertz
Frequencies in FM radio are measured in megahertz (MHz). A megahertz is a unit that represents one million hertz (Hz).
Hertz is the unit of frequency in the International System of Units (SI). It denotes the number of cycles per second of a periodic phenomenon.
Thus, 1 MHz is equal to 1,000,000 cycles per second. When you tune your radio to 103.7 MHz, your radio receiver locks onto radio waves cycling at 103.7 million times per second.
Frequency Measurement
Frequency measurement is crucial in radio communications. It determines which station your radio tunes into.
To measure frequency, engineers use a tool called a frequency counter. This device counts the number of oscillations of the signal per second.
FM radio stations are assigned specific frequencies to avoid overlapping signals. Each station is given its own 'slot' within the 88-108 MHz range to ensure clear signal transmission.
Signal Transmission
Signal transmission is the process of sending information from one place to another via electromagnetic waves.
In FM radio, the audio signal modulates the frequency of the electromagnetic wave, which transmits the information.
Radio antennas broadcast these modulated waves, which travel through the air and reach FM receivers, like your car or home radio.
When your radio is set to a given frequency, it receives and demodulates these waves, converting them back into audio signals you can hear.

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Most popular questions from this chapter

Besides the frequency of the alternating current source, what else is important in determining the frequency of a transmitted electromagnetic wave?

List, in order of frequency, from low to high, at least four portions of the electromagnetic spectrum.

Explain what frequency modulation means.
See all solutions

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