Me again ! :surprised(adsbygoogle = window.adsbygoogle || []).push({});

I have the following question and this time I really have no idea!

2 sinusoidal waves, identical except for their phase, travel in the same direction along a stretched string and interfere to produce a resultant wave given by:

x(z,t) = 3Cos (20z-4t+0.82)

Where x is in mm, z in metres and t in seconds

a- What is the wavelength of the 2 original waves

b- What is the phase difference between them

c- What is their amplitude

At the present I'm stuck on 'a' and may/may not be able to do b and c once I know how to work out 'a'.

I can see how to add original waves, but how do I go about resolving the resultant wave? I guess it's similar to vector algebra, but mmmmm.... really don't know where to begin on this one.

Any help would be very much appreciated.

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# Homework Help: Wave interference and resolving resultants

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