Are the radio waves we receive on our radios electromagnetic waves just like light?

I don't think it's the same, the radio waves are radio waves, some like the radio waves of a television set, or the same! The intensity of this wave varies with distance, and the strength is weak at a distance!

The waves contained in light are different, it is divided into infrared rays, ultraviolet rays, and various rays according to the different wavelengths and frequencies of various waves, which is the classification of sunlight, it belongs to natural light, it does not change with distance

The lights in our daily life seem to be natural light, but they are different in intensity depending on the distance

Some of the light used in medicine can emit special rays, which have a certain harmful effect on the human body, but that is due to the role they should play!

The above is my personal opinion, most of the physics knowledge learned in high school, there may be some differences, but most of them are correct, I hope it can help your questions!

It's electromagnetic waves! Don't you understand such a simple physics knowledge? Odd!

Electromagnetic waves come in different wavelengths, from gamma rays with the shortest wavelength, to longer X-rays, to some ultraviolet rays, then to visible light, infrared, microwave, shortwave, mediumwave, and longwave. Such an electromagnetic spectrum is a continuous transition and there is no essential difference! Check it out here

No, a light wave is a type of particle wave (invisible to the naked eye).

Electromagnetic waves are waves produced by an invisible electromagnetic field (which is also invisible to the naked eye).

Short wave travel distance!

The speed of the radio waves is as fast as the speed.

It's all written on the panel scale of the radio, and the advanced machine is still digitally displayed.

medium wave 535 1605kHz;

one (or more segments) of the shortwave in the 2 26MHz range;

The FM wave is at 87 108MHz.

It's not as simple as saying which is long and which is short. The frequency range of the 5th channel of the TV and the FM radio range of the radio overlap and overlap, because the frequency range of the FM radio is 88 108MHz, the bandwidth of the TV broadcast is 8MHz, and the accompanying audio rate of the 5th channel is exactly within this range, so some FM radios can listen to the accompaniment of the program of the 5th channel of the TV. Channels above Channel 6 of the Trembling TV broadcast are well beyond the maximum frequency range of the radio.

However, the frequency range of TV's Channel 1 and 4 has not exceeded the frequency of FM radio broadcasts. The short and medium waves of radio, on the other hand, are much lower than the frequency range of television broadcasting.

Therefore, the wavelength of the short wave in the radio should be longer than the wavelength of the television based on the wavelength of the television, the wavelength of the TV channel 1 4 is longer than the wavelength of the radio FM broadcast, the wavelength of the TV channel 5 is similar to the wavelength of the radio FM broadcast, and the wavelength of the TV channel 6 or more is much shorter than the wavelength of the radio.

Radio electromagnetic waves are longer.

1) The radio will make a "click" sound, because when the wire head slides on the file surface, it produces a changing current circle, which provokes electromagnetic waves into the air;

Hail quietly 2) When thunder and lightning, you can also hear a "click" sound when you turn on the radio

Radios can only use antennas to receive electromagnetic waves, but cannot emit electromagnetic waves; And the radio can receive a variety of electromagnetic waves, and the radio tune is to adjust the frequency of the electromagnetic group car wave by adjusting what it is connected to, so that its own frequency is consistent with the received electromagnetic wave, so as to achieve resonance, so as to select the required electromagnetic wave so a correct

So choose A

The principle of radio is to restore the high-frequency signal received from the antenna into an audio signal through detection (demodulation), and send it to the headset to become a sound wave.

Due to the development of broadcasting, there are a lot of radio waves of different frequencies in the sky. If you pick up all these radio waves, the audio signal will be as if you are in a busy city, and many sounds will be mixed together, and as a result, you will not be able to hear anything clearly.

In order to try to select the desired program, after receiving the antenna, there is a selective circuit, its function is to pick out the required signal (station), and "filter out" the unwanted signal to avoid interference, which is the "select station" button used when we listen to the radio.

The output of the selective circuit is to select the high-frequency amplitude modulation signal of a certain station, and it is not possible to use it to directly push the headphone (electro-acoustic device), but also to restore it to the original audio signal, this reduction circuit is called demodulation, and the demodulated audio signal is sent to the earphone, and the broadcast can be received. The simplest radio mentioned above is called a direct detector, but the high-frequency antenna electrical signal obtained from the receiving antenna is generally very weak, and it is not appropriate to send it directly to the detector.

It is best to insert a high-frequency amplifier between the selection circuit and the geophone to amplify the high-frequency signal. Even if a high-frequency amplifier has been added, the power of the detector output is usually only a few milliwatts, and it is okay to listen to it with headphones, but it is too small to use a speaker, so an audio amplifier is added after the detector output to push the speaker. High-amplification radios are more sensitive and powerful than direct detection radios, but they are less selective and more complex to tune.

The frequency of the radio and the frequency of the received signal are one IF difference, so the selection circuit before the mixer and the local oscillator are tuned with a unified tuning line, such as a coaxial double capacitor (PVC), so that the difference is kept at a fixed IF value.

Because the intermediate frequency is fixed, and the frequency is lower than the high-frequency modulated signal, the gain of the intermediate amplification can be larger, the work is more stable, and the passband characteristics can also be more ideal, so that the detector can obtain a large enough signal, so that the whole machine can output a better audio signal with better sound quality.

The purpose of the radio is to receive electromagnetic signals of different frequencies and convert them into sound.

That's because that's the special structure of the radio.

That's where the internal parts come in.

This is because electromagnetic waves are completely different.

This is because the flatness of electromagnetic waves is different.

Because the radio has this unique function.

The structure inside is designed to collect frequency signals.

This is because his own settings can be changed.

That's what the radio is for, isn't it?

I think there are a lot of reasons.