Yes, different wavelengths of electromagnetic waves can be turned into a beam. This process is commonly achieved through the use of antennas or other waveguiding structures. Antennas are designed to efficiently radiate or receive electromagnetic waves at specific frequencies.
Antennas are typically designed to be resonant at a specific frequency or a narrow range of frequencies. By properly shaping and configuring the antenna elements, it is possible to direct the radiated energy into a beam with a specific directionality and pattern.
When it comes to different frequencies, the design of the antenna needs to take into account the specific wavelength of the electromagnetic waves. The size and shape of the antenna are determined based on the wavelength, and they need to be appropriate for the frequency range of interest. This is why different types of antennas are used for different frequency bands, such as dipole antennas for FM radio, patch antennas for Wi-Fi, or parabolic reflector antennas for satellite communication.
Regarding your question about radio waves and their frequency, the frequency of an electromagnetic wave is inversely proportional to its wavelength. Radio waves have long wavelengths, which correspond to low frequencies. Higher frequencies, such as those used for visible light or X-rays, have shorter wavelengths. The reason why radio waves cannot have higher frequencies and shorter wavelengths is because the physical properties of the medium through which the waves propagate impose limitations.
To increase the frequency of a wave, you would need to change the properties of the medium or use a different medium altogether. Multiple sources, in this case, would not increase the frequency of the waves. Multiple sources can be used to enhance the radiation pattern or to provide a more focused and directional beam, but they do not change the inherent frequency of the waves.
In summary, different wavelengths of electromagnetic waves can be turned into a beam through the use of antennas or waveguides. The frequency of a wave is determined by its wavelength, and different frequencies require different antenna designs. Radio waves have long wavelengths and lower frequencies due to the physical properties of the medium, and multiple sources do not change the frequency of the waves.