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The ratio of the wavelength of AM radio waves traveling in a vacuum to the wavelength of FM radio waves traveling in a vacuum is approximately

1.) 1 to 1
2.) 2 to 1
3.) 10^2 to 1
4.) 10^8 to 1

Respuesta :

AL2006

This question is a big fat non sequitur !

The wavelength of radio waves traveling through vacuum only depends on the frequency that the radio station is licensed to broadcast on, (which had better be the frequency of the transmitter that they buy and use, or they're in big trouble).

The wavelength does NOT depend on the type of modulation that's used to put information onto the signal.  

An amateur radio (ham) operator may very well start out using FM to talk over his radio to somebody else, and then for some reason they may decide to switch to AM.  They can do that without ANY change in the wavelength of their transmissions.

Now, in the USA and many other countries, it so happens that all AM stations are licensed by their governments to transmit their programs on a channel somewhere between 500 KHz and 1.6 MHz, and all FM stations are licensed by their governments to transmit their programs on a channel somewhere between 88 MHz and 108 MHz.  (And THAT's what the radio receivers in these countries are built to receive.)

Then we might say that all of the AM stations are grouped around 1 MHz, and all of the FM stations are grouped around 100 MHz.  The FM frequencies are very roughly 100 times the AM frequencies, so the AM wavelengths are very roughly  100 times the FM wavelengths.  That's choice (3) .

But please don't get the idea that it has anything to do with using AM or FM technology.  It's just a matter of where in the spectrum the government decided to put the AM stations and where they put the FM stations.

For that matter . . . An analog TV station uses an AM signal for the picture and an FM signal for the sound, and it all goes in the same channel, with just about the same wavelengths !

facundo3141592

We will see that AM wavelengths are, in average, 100 times larger than FM wavelengths, so the correct option is the third one.

How to find the ratio between the wavelengths?

First, we need to find the wavelengths.

  • For AM waves, the average is: 360m  (the range is from 170m to 550m)
  • For FM waves, the range is:  3.1m        (the range is from 2.78m to 3.41m)

Then the ratio is given by the quotient between these two:

360m/3.1m = 116

This means that AM waves have a wavelength around 100 times larger than FM waves, so the ratio of AM wavelength to FM wavelength is:

100 to 1.

Or, written like in the options:

10^2 to 1.

So the correct option is the third one.

If you want to learn more about waves, you can read:

https://brainly.com/question/14015797

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