There are two different point sources which produce spherical waves with the same power, amplitude, ω, wavenumber and phase.
I can calculate the intensity of each wave in a point: $$ I_1 = P / (4 \pi r_1^2) $$ $$ I_2 = P / (4 \pi r_2^2) $$ But how can I calculate the intensity of the resulting wave in that point?
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