Radio waves, light and X-rays, electromagnetic waves
What is you question? Do you want definitions? Try using google.com and search with the subject or
"definition of___"
One of the many sites you will find is:
http://www.thefreedictionary.com/electromagnetic+wave
The first three things you mentioned are different types of electromagnetic waves.
Radio waves, light, and X-rays are all examples of electromagnetic waves, which are waves of energy that can travel through empty space or through a medium. Electromagnetic waves are characterized by their frequency and wavelength.
To understand the differences between these types of waves, let's start with radio waves. Radio waves have the longest wavelength and lowest frequency among these three types. They are commonly used for communication, such as in radio and television broadcasting, cell phones, and wireless networks. To generate and receive radio waves, devices like antennas and transmitters are used.
Moving towards the higher frequencies and shorter wavelengths, we come to light waves. Light waves encompass the visible spectrum, which is the range of electromagnetic waves that humans can see. The visible spectrum spans from shorter wavelength violet light to longer wavelength red light. Objects reflect, absorb, or transmit light waves, and this interaction determines the colors we perceive. Light waves are produced by sources such as the sun, light bulbs, or lasers.
Finally, X-rays have even higher frequencies and shorter wavelengths than light waves. X-rays have the ability to penetrate different materials to varying degrees. This property makes them useful in various applications, including medical imaging (X-rays), security scanning, and material analysis.
In summary, the key differences between radio waves, light waves (visible spectrum), and X-rays lie in their frequencies, wavelengths, and areas of application. Radio waves have the longest wavelength and are used for communication. Light waves span the visible spectrum and are responsible for the colors we see. X-rays have the shortest wavelength and are used for medical imaging and security purposes.
If you have any further questions or need more specific information on any of these topics, please feel free to ask!