The wave shown above can be described by a variety of properties. One such property is amplitude. The amplitude of a wave refers to the maximum amount of displacement of a particle on the medium from its rest position. In a sense, the amplitude is the distance from rest to crest. Similarly, the amplitude can be measured from the rest position to the trough position.
1 ISIS leader Abu Bakr al-Baghdadi may have been wounded in an airstrike. 2  Even if he gets killed, a throng of very professional leaders could take his place. 3  Al-Baghdadi has two top deputies, one over operations in Iraq and one over Syria. 4  The Shura Council, ISIS' religious monitor, could tell al-Baghdadi to go.
Timeline: The emergence of Isis. 1  1/40 2000 Abu Musab al-Zarqawi (pictured here) forms an al-Qaeda splinter group in Iraq, al-Qaâeda in Iraq. Its brutality from the beginning alienates Iraqis and many al-Qaeda leaders. 2  2/40 2006 Al-Zarqawi is killed in a U.S. strike.