Two waves represented by the following equations are travelling in the same medium ${y}_{1}=5\mathrm{sin}2\pi \left(75t-0.25x\right)$, ${y}_{2}=10\mathrm{sin}2\pi \left(150t-0.50x\right)$

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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