phyics 53 lecture			dr. brown		7 december 2010

recall superposition principle

applies to wave equation for waves on string, sound, electromagnetic

consider two sources with slightly different wave numbers and wave frequencies

find sum using trig sub and then note that Intensity is proportional to amplitude squared

beats = one interesting result of superposition [slowly varying intensity with beat frequency = f_2-f_1

standing waves

    resonance modes for:

	string fixed at both ends

	fixed at one end and free at the other
   
    	organ pipe closed at one end and open at the other

determination for speed of sound in gas