After the elements of Mendeleev's table, in which some of them have partly high density, we reach objects in the universe such as white dwarfs, magnetars, black holes, etc. If it looks carefully, the density range of these objects is 10^14 to 10^20 kg/m3. In this video we discover a smallest particle in the universe, with a density of 10^42 kg/m3.
In this video we will show that for electromagnetic waves, 4 types of speed can be defined: 1. Linear speed 2. Wavelike speed 3. True speed 4. Total speed The important note is that these 4 speeds are among the intrinsic characteristics of electromagnetic waves, and depending on different conditions, these 4 speeds can be used. In other words, different speeds are considered based on the path, direction, observer, etc.