Alnilam is the brightest star
Absolute brightness is how bright the star actually is. Apparent brightness is how bright the star looks.
Factors that influence how bright a star looks is distance. The fact that Alnilam has the same apparent brightness of the other two stars even though it is farther away, means that it is brighter.
When two tectonic plates collide and form a converging plate boundry, normally one of the plates will slide underneath the other and that is when Subduction occurs.
In a direct current, the electric charge, or current, only flows in one direction. In an alternating current, the electric charge changes periodically.
Hope this shows! It has all the equations for all of the problems u asked in the comments
