When waves go through a small opening in a barrier they have the ability to spread out, and this is called QUESTION 8 If a crest with an amplitude of 4.0cm meets a trough with an amplitude of 2.0cm on the same medium at the same time, what is the amplitude of the resutant wave. (State your answer as a magnitude only, without units) QUESTION 9 If a trough with an amplitude of 6.0cm meets another trough with an amplitude of 12.0cm, what will the amplitude of the resultant wave be? (State your answer as a magnitude only, without units) QUESTION 10 Describe what happens when a wave hits a barrier with 2 small openings in it: For the toolbar, press AlT+F1n IPR in