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

W
The intensity ratio \( I_{1} / I_{2} \) of the two waves is [UPSEAT 2002]
(a) \( 1: 2 \)
(b) \( 1: 4 \)
(c) \( 1: 8 \)
(d) \( 1: 16 \)
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