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# Physics HELP! Stationary waves!

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1. Okay so two waves travelling in opposite directions blady bla bla...
DO THE TWO WAVES HAVE TO BE IN ANTI-PHASE TO FORM A STATIONARY WAVE . IF NOT WHY?
Okay so two waves travelling in opposite directions blady bla bla...
DO THE TWO WAVES HAVE TO BE IN ANTI-PHASE TO FORM A STATIONARY WAVE . IF NOT WHY?
It works like this - the phase relationship between the two waves changes as the difference between the path length of the waves changes.
so at some positions they'll be in antiphase and the result is a node (which is minimum amplitude of the stationary wave)... at other positions they'll be in phase and you have an antinode (maximum amplitude of the stationary wave)

a stationary wave might have several nodes and antinodes... which is several places where the waves are in antiphase and several places where they are in phase.

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