Fri July 13, 2012 By: Rishi Kumar

How to derive the expression of superposition principle ?

Expert Reply
Sat July 14, 2012
Let there be two waves:
Only waves with comparable frequency (almost equal) and same amplitude can have superimposition between them.
Thus the above two waves have a phase difference of phi
Thus their resultant displacement is:
The above relation can be easily obtained by sing some identities of trigonometry.
Thus here the resultant amplitude is 2acos(?/2)
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