Two waves represented by the following equations are travelling in the same medium y1=5sin2π(75t0.25x), y2=10sin2π(150t0.50x)

The intensity ratio I1/I2 of the two waves is 

(1) 1 : 2

(2) 1 : 4

(3) 1 : 8

(4) 1 : 16

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