What is bigger radio waves or light waves?

Answer 1

One can say that radio waves are a million times bigger than light, but one needs to be a little more specific about what you mean when you say it.

When we speak of the size of a wave, we usually refer to its amplitude or wavelength and in this case, wavelength seems to be relevant to the question.

Radio waves and light are both electromagnetic waves and the two terms refer to different parts of the electromagnetic spectrum.

Visible light has wavelengths of a few hundred nanometers, although one can expand that region somewhat beyond the visible and still find that the term "light" is used.

Radio waves are much longer and generally the spectral region which we call radio is in the ball park of a meter. (It is not uncommon to apply the term radio waves to much longer wavelengths however.)

Though there is not one specific measure of "size," radio waves generally have a wavelength of a million times greater that light waves.

Answer 2

Both AM and FM can be used at any desired frequency.

Concerning the commercial broadcast services that you hear on the radio in your

home or your car, the frequencies allocated to FM stations in the US are higher

than the frequencies allocated to AM stations.

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The bandwidth of FM doesn't need to be any greater than the bandwidth

of AM, so long as the modulation index is kept small ... the mode known

as "Narrow Band FM". The second answer, between the dashed lines, is

correct, in that a larger bandwidth of baseband information requires a larger

occupied bandwidth after modulation.

But the original question isn't probing the subject to that depth. It's asking either

one of two things: 1). "Does the AM or FM process require a higher carrier frequency ?", or

2). "Do the AM or the FM stations on my radio have the higher carrier frequency ?"

The answer above the first dashed line answers both of those.

Answer 3

There's no connection between the wavelength of a radio wave and the way

it's been modulated to add information to it.

Speaking only about comercial broadcasting stations in the USA, AM stations

operate at longer wavelengths than FM stations do. But that's just the way

they happen to be assigned; it could just as well be the other way around.

Answer 4

The wavelength is not connected with the type of modulation. Any radio wave

at any frequency/wavelength can be modulated with either process.

In commercial broadcasting, FM stations are assigned higher frequency / shorter wavelength

allocations than AM stations are.

Answer 5

No. It is not true. It is false, and if anybody tries to tell you

that it's true, kindly ask him to come see me.