What are the three properties of components of the universe that can be determined using electromagnetic radiation

The three properties of components of the universe are frequency, wavelength and Intensity can be determined using electromagnetic radiation. Frequency is defined as the number of cycles per second, and it's unit is Hertz (Hz). Formula is E=hν. Wavelength is the distance of one full cycle of the oscillation. The wavelength related to frequency formula is c=Î"ν. Amplitude is the distance from the maximum vertical displacement of the wave to the middle of the wave. Then amplitude tells about the brightness of the wave.