a] First option is correct
y2 receives maximum first because of phase difference, there sum is given wrong in last graph. So first graph is correct.
b] wavelength = 10m
amplitude = 3.7 m
c] wavelength = 10 m
amplitude = sqrt(3.7^2+3.7^2+ 2*3.7^2*cos 45 degree) = 6.84 m
consider two wave functions, y,(x, t) = 3.70 m sinl-m-"X-5π s-산 and 5 4 (a) Uslng...
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