Resultant amplitude for waves of different frequencies?

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SUMMARY

The discussion focuses on calculating the resultant amplitude of two superimposing waves represented by the equations y1= 2sin 2π(10t – 0.4x) and y2= 4sin 2π(20t – 0.8x). The key conclusion is that the maximum amplitude is the sum of the individual amplitudes (a1 + a2) and the minimum amplitude is the difference (a1 - a2), applicable only for waves of the same frequency. The intensity ratio of Imax to Imin is determined to be 25:9, highlighting the importance of understanding wave interference principles.

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mintkints
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Homework Statement



Two superimposing waves are represented by equations
y1= 2sin 2π(10t – 0.4x)

y2= 4sin 2π(20t – 0.8x)

Find the ratio of Imax and Imin. Ans is (25:9)

Homework Equations

The Attempt at a Solution


I know that intensity is proportional to the square of amplitude and

maximum amplitude = a1 + a2

minimum amplitude = a1 - a2

but these equations are only applicable for waves with same frequency. so how do I proceed ? Thanks in advance!
 
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mintkints said:
how do I proceed ?
Consider some fixed point x along the wave. How would you find the net amplitude at that point?
 

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